Electronic money system, electronic value transfer method, mobile terminal, method for controlling mobile terminal, program product, and recording medium on which program product is recorded

Abstract

Example embodiments enable a server-side value stored in an electronic money server to be transmitted automatically to a mobile terminal prior to payment. This enables payments when a payment terminal only processes payments based on the terminal-side value balance. An asynchronous payment terminal emits ultrasonic waves indicating that the payment terminal is not compatible with payment processes on the basis of a server-side balance. If the mobile terminal determines that the volume of the detected ultrasonic waves corresponds to a received ultrasonic wave pattern that appears while the mobile terminal is near the ultrasonic wave emission source, the mobile terminal transmits a value shift request to an electronic money server that then subtracts a predetermined amount from the server-side value balance, and transmits amount change information which increases the terminal-side value balance by that predetermined amount. An IC module then updates (increases) the terminal-side value balance.