| 摘要 |
PROBLEM TO BE SOLVED: To solve the drawback that in a prize, exchange system where plural users (game parlors and shops) use a terminal to make an access to a server through a public communication network like the Internet and there is a fear that score data recorded in a storage medium of the server is changed unjustly by a third person other than game parlors. SOLUTION: A server 20 and a backup server 6 are provided. The server 20 is provided with the storage medium 2A in which the present value of score data, into which the number of game media like pachinko balls is converted, is recorded. The backup server 6 is disposed in a distance place away from the server 20 and provided with a storage medium 6A in which the previous value a certain time before the present value is recorded in codes. The server 20 reads the history of the differences between the present value and the precious value. When the difference between the present value and the previous value is more than a prescribed value several times in succession, the backup server 6 determines that the data has been changed dishonestly and prohibits handing off or the delivery of prizes based on the wrong data.
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