| 摘要 |
A client terminal, such as mobile terminal, stores a version number of its installed data or control program and transmits a request message to the server system via a communication network in response to an event triggered by a user of the client terminal, the request message containing the version number of the data and a phone number of the client terminal. The server system stores most recent data and a version number of the most recent data. When the server system receives the transmitted request, it compares the version number contained in the received request to the stored version number and transmits a copy of the most recent data and the version number of the most recent data to the client terminal via the communication network if there is a mismatch between the compared version numbers. The client terminal receives the copy of the most recent data and the version number from the server system and updates the installed data with the received copy and updates the stored version number with the received version number.
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