| 摘要 |
PROBLEM TO BE SOLVED: To reduce the load of communication processing, and to ensure the security of data in sharing data. SOLUTION: Data management files DFA, DFB, and DFC indicating the sharing relation of data in plural terminals are preliminarily stored in a data management file preserving part 134 for each data A, B, and C to be shared. In updating the data A to be shared, a data transmitting and receiving part transmits the data A as update information for data update to the other terminals based on the data management file DFA corresponding to the data A. Thus, it is possible to prevent any update information form being transmitted to the device in no data sharing relation.
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