DATA UPDATE SYSTEM, UPDATE REQUEST DEVICE, DATA UPDATE DEVICE, UPDATE REQUEST METHOD, DATA UPDATE METHOD, UPDATE REQUEST PROGRAM AND DATA UPDATE PROGRAM

摘要

PROBLEM TO BE SOLVED: To accurately reflect update content on data.;SOLUTION: When not receiving any new update information RD updated so as to show the update sum data of this time from a charging device 23, a merchandise providing device 22 transmits user identification information and the update information RD and price information to the other charging device 23, and when the update identification information RS of the received update information RD is matched the update identification information RS of the read update information RD, the charging device 23 updates the sum data and the update information RD, and transfers them to the other charging device 23, and transmits the updated update information RD to the merchandise providing device 22. Thus, it is possible to prevent old data from being updated, and to update the latest data, and to accurately reflect the update content on the data.;COPYRIGHT: (C)2008,JPO&INPIT