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|1. (WO2018043321) DATA MANAGEMENT APPARATUS, DATA MANAGEMENT METHOD, AND DATA COMMUNICATION SYSTEM|
|Title:||DATA MANAGEMENT APPARATUS, DATA MANAGEMENT METHOD, AND DATA COMMUNICATION SYSTEM|
A data management apparatus for managing a plurality of data items output from a plurality of communication devices that output data, the data management apparatus comprising: a storage unit in which device identifying information of each of the plurality of communication devices is associated with charge identifying information and stored, the charge identifying information including either subscriber identifying information of a subscriber of a contract to use a relay apparatus for transferring the plurality of data items to the data management apparatus, or acquirer identifying information of a data acquirer who acquires the data from the data management apparatus; and a charge amount determination unit which determines, for each item of the charge identifying information, a charge amount on the basis of a data communication volume corresponding to data output from the communication device of one or a plurality of device identifying information items associated with the charge identifying information and stored.