| 摘要 |
<p>The present invention provides electronic coupons so as not to surpass a desired number even when multiple electronic coupons are written by sharing a memory region in a terminal device. A storage unit (13) stores the number of un-used electronic coupons which were determined to be successfully written in a memory region (251), an undetermined number in which the success of the writing process is undetermined, and the remaining number of electronic coupons that can be newly provided to multiple terminal devices. A first updating unit (111) adds a number from which the total remaining number of first electronic coupons is subtracted to the undetermined numbers of the first electronic coupons. A second updating unit (113) commands a terminal device (20) to write the undetermined number of first electronic coupons. Subsequently, the second updating unit (113) sets the undetermined number of first electronic coupons as the number of un-used first electronic coupons once the terminal device (20) successfully accomplishes the writing process. Then, when the memory region (251) in which second electronic coupons are stored is overwritten with the first electronic coupons, the second updating unit (113) returns the number of un-used second electronic coupons to the remaining number.</p> |
