A server 10 acquires, from a setting terminal 70, condition data indicating summarization conditions (S40) and stores the condition data in a memory (S42). Every time the server 10 acquires device data from a device 60, the server 10 stores the acquired device data in the memory (S50 to S56, S64, S66). The server 10 performs partial summarization in accordance with the device data stored in the memory and the summarization conditions indicated by the condition data, and generates partial-summarization data (S60, S70). The server 10 stores the generated partial-summarization data in the memory (S62, S72). When a browsing request is acquired from a browsing terminal, the server 10 generates browsing data by using the partial-summarization data in the memory and supplies the browsing data to the browsing terminal.