| 摘要 |
PROBLEM TO BE SOLVED: To provide a data management system where each reception terminal can manage data of its own without the need for a data transmitter side to always set an expiration date. SOLUTION: The data transmitter side transmits a valid data list where valid data at present are listed to reception terminals 107 and each reception terminal receiving the valid data list compares contents of data stored in each reception terminal with contents of the valid data list and deletes data that are stored in itself and not described in the valid data list. Thus, each reception terminal can delete data without the need for setting the expiration date to files of its own and grasp the presence of deficient data so as to keep the consistency of data. |
