| 摘要 |
In order to enable a server-side value stored in an electronic money server to be transmitted automatically to a mobile terminal prior to payment and thus to enable payments on the basis of the terminal-side value balance when a payment terminal only has a function whereby payments are made on the basis of the terminal-side value balance, an asynchronous payment terminal emits ultrasonic waves from an ultrasonic wave emission source, indicating that the payment terminal is not compatible with payment processes on the basis of a server-side balance. When the ultrasonic waves are detected a mobile terminal determines that a payment on the basis of the server-side value balance is not possible, and determines whether the volume of the ultrasonic waves corresponds to a received ultrasonic wave pattern that appears when the mobile terminal is near the ultrasonic wave emission source. When it is determined that there is a correspondence, the mobile terminal transmits a value shift request to an electronic money server. The electronic money server receives this request, subtracts a predetermined amount from the server-side value balance, and then transmits amount change information which increases the terminal-side value balance by that predetermined amount. An IC module receives the amount change information updates (increases) the terminal-side value balance. |
