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1. EP2515537 - CONTENT DELIVERY SYSTEM, CONTENT DELIVERY APPARATUS, CONTENT PLAYBACK TERMINAL AND CONTENT DELIVERY METHOD

注意: このテキストは、OCR 処理によってテキスト化されたものです。法的な用途には PDF 版をご利用ください。

[ EN ]
Claims

1. A content distribution system in which a content distribution device performs on-demand distribution of video content to a content playback terminal via a network,
wherein the content distribution device comprises:

a storage unit configured to store at least a plurality of video contents, and menu information in which a list of the video contents and identification informations of the video contents are described; and

a data distributor configured to add to the menu information, cache control information in which at least one of the video contents described in a distribution menu is described, and distribute the menu information to the content playback terminal, and if identification information indicating the video content is received from the content playback terminal, the data distributor being configured to read the video content corresponding to the identification information from the storage unit, and transmit the video content to the content playback terminal, and

the content playback terminal comprises:

a display unit;

a temporal storage unit;

a video content playback unit configured to cause the display unit to display the menu information and the video content;

a browser unit configured to add to a distribution request, the identification information of video content selected from the video contents on the distribution menu displayed on the display unit based on the menu information, and transmit the distribution request to the content distribution device; and

a data transmission and reception unit configured to, if the cache control information is added to the menu information, transmit to the content distribution device, a distribution request for the video content described in the cache control information, before a user selects video content from the distribution menu, and the data transmission and reception unit being configured to write in the temporal storage unit, the video content distributed in response to the distribution request.


  2. The content distribution system according to claim 1, wherein the storage unit is configured to store a plurality of menu informations and cache control information correlated to the menu informations, identification information of the same video content being described in the cache control information.
  3. The content distribution system according to claim 1 or 2, wherein each of the video contents is divided into a plurality of partial video contents,
the storage unit is configured to store, for each of the video contents which corresponds to the partial video contents, the partial video contents and a play list correlated to the partial video contents, a playback order of the partial video contents and identification informations of the partial video contents being described in the play list, and
identification information of the video content is added to the play list.
  4. The content distribution system according to claim 1 or 2, wherein if the data transmission and reception unit makes a distribution request for the video content described in the cache control information, the data distributor is configured to transmit to the content playback terminal, a beginning part of the video content requested for distribution, the beginning part having a predetermined amount of data counted from a playback start point of the video content.
  5. The content distribution system according to any one of claims 1 to 4, wherein the browser unit is configured to display, when displaying the distribution menu on the display unit, video content described in the cache control information in a visually more emphasized display format, compared to video content not described in the cache control information.
  6. The content distribution system according to any one of claims 1 to 4, wherein the browser unit is configured to group one or more video contents, which are described in the cache control information and stored in the temporal storage unit, to one genre on the distribution menu, and display the genre with other genres on the distribution menu.
  7. The content distribution system according to any one of claims 1 to 6, wherein attribution information is added to the cache control information for each of the video contents, and
the data transmission and reception unit is configured to determine, based on the attribute information, an order of distribution requests for the video contents described in the cache control information.
  8. The content distribution system according to claim 7, wherein the attribute information includes the data lengths of the video contents, and
the data transmission and reception unit is configured to make distribution requests for the video contents described in the cache control information in order according to the data length with the shortest data length first.
  9. The content distribution system according to claim 7, wherein the attribute information includes information indicating a genre of the video content, and
the data transmission and reception unit is configured to make a distribution request for the video content which is described in the cache control information and is added with the attribute information indicating the same genre as a genre preliminarily set in the data transmission and reception unit, in preference to the video content which is described in the cache control information and is added with the attribute information indicating a different genre from the genre preliminarily set.
  10. The content distribution system according to any one of claims 1 to 6, wherein the content distribution device further comprises:

a distribution history database configured to store identification informations of the video contents requested for distribution and distribution destination identification informations that identify sources of the distribution requests for the video contents, while correlating the identification informations and the distribution destination identification informations; and

a cache control information generator configured to generate different cache control informations respectively for the distribution destination identification informations, based on a distribution history recorded in the distribution history database,

wherein the cache control information generator is configured to read the distribution history corresponding to each of the distribution destination identification informations, and generate different cache control informations respectively for the distribution destination identification informations, and

the data distributor is configured to distribute the cache control informations generated by the cache control information generator, to content playback terminals respectively corresponding to the distribution source identification informations.


  11. A content distribution device configured to be used in a content distribution system in which the content distribution device performs on-demand distribution of video content to a content playback terminal via a network, the content distribution device comprising:

a storage unit configured to store at least a plurality of video contents, and menu information in which a list of the video contents and identification informations of the video contents are described; and

a data distributor configured to add to the menu information, cache control information in which at least one of the video contents described in a distribution menu is described, and distribute the menu information to the content playback terminal, and if identification information indicating the video content is received from the content playback terminal, the data distributor being configured to read the video content corresponding to the identification information from the storage unit, and transmit the video content to the content playback terminal.


  12. A content playback terminal configured to be used in a content distribution system in which a content distribution device performs on-demand distribution of video content to the content playback terminal via a network, the content playback terminal comprising:

a display unit;

a temporal storage unit;

a video content playback unit configured to cause the display unit to display the menu information and the video content;

a browser unit configured to add to a distribution request, the identification information of video content selected from the video contents on a distribution menu displayed on the display unit based on the menu information, and transmit the distribution request to the content distribution device; and

a data transmission and reception unit configured to, if the cache control information is added to the menu information, transmit to the content distribution device, a distribution request for the video content described in the cache control information, before a user selects video content from the distribution menu, and the data transmission and reception unit being configured to write in the temporal storage unit, the video content distributed in response to the distribution request.


  13. A content distribution method using a content distribution system in which a content distribution device performs on-demand distribution of video content to a content playback terminal via a network, the content distribution method comprising steps for a data distributor included in the content distribution device:

adding to menu information showing video contents to be distributed, cache control information in which at least one of video contents described in a distribution menu is described;

distributing the menu information to the content playback terminal;

if identification information indicating the video content is received from the content playback terminal, reading the video content corresponding to the identification information from a storage unit storing at least a plurality of video contents, and menu information in which a list of the video contents and identification informations of the video contents are described; and

transmitting the video content to the content playback terminal, and

the content distribution method further comprising:

if a video content playback unit of the content playback terminal causes a display unit of the content playback terminal to display the menu information and the video content, a step of a browser unit of the content playback terminal adding to a distribution request, the identification information of video content selected from the video contents on the distribution menu displayed on the display unit based on the menu information, and transmitting the distribution request to the content distribution device; and

if the cache control information is added to the menu information, a step of a data transmission and reception unit of the content playback terminal transmitting to the content distribution device, a distribution request for the video content described in the cache control information, before a user selects video content from the distribution menu, and writing in the temporal storage unit, the video content distributed in response to the distribution request.