To match a card side value with a control server side value thereof even when writing processing for a card is conducted on line.

A control condition for a control server and a control condition for the card are prepared respectively as a server condition flag and a card condition flag, the server condition flag and the card condition flag are updated from time to time during communication between the card and the control server, whether the writing processing from the control server to the card is finished normally or not is judged by the card condition flag, and rewriting processing to the determined card is carried out in response to the card condition flag and the server condition flag, when the communication between the card and the control server is established in the next time, in the case where the writing processing is not finished normally.