DATA COMMUNICATION SYSTEM, SERVER DEVICE, DATA COMMUNICATION METHOD, AND PROGRAM THEREOF

摘要

[PROBLEMS] To provide a data communication system capable of reducing the communication amount even when the data request object by a client is not identical. [MEANS FOR SOLVING PROBLEMS] When a server (1) transmits data requested, the server generates a difference between the transmission object data and all cache data in a cache storage unit (15) in a difference information generation comparison unit (16), transmits the difference data of the minimum size together with the identifier of the cache data, and updates the cache data in the cache storage unit (15). A client (2) restores the original data from the difference data received by an information restoration unit (26) and the cache data in the cache storage unit (25) correlated to the cache identifier and updates the cache data in the cache storage unit (25) by the same method as the server (1).