MANAGEMENT DEVICE, MANAGEMENT METHOD, AND PROGRAM

摘要

A management device (101) manages a transaction in which a transaction item is supplied during the period from the beginning to the end of the transaction and the total amount of the transaction item supplied can only be ascertained at the end of the transaction. A communication unit (102) communicates with a portable device located within a communication coverage area. A request unit (103) transmits, to the portable device, a request that a remaining value associated with the portable device be decreased by an amount corresponding to a minimum price value, which corresponds to the minimum unit of transaction for the transaction item. If the response to the request, received from the portable device, indicates that the request is successful, then a control unit (104) performs control to supply an amount of the transaction item corresponding to the minimum unit of transaction. After the amount of the transaction item corresponding to the minimum unit of transaction has been supplied in response to the response indicating that the request is successful, a determination unit (105) determines whether it is possible to further supply the amount of the transaction item corresponding to the minimum unit of transaction, on the basis of the supply status of the transaction item. If the further supply is possible, then a next request is transmitted to the portable device, said next request requesting that the remaining value associated with the portable device be further decreased by an amount corresponding to the minimum price value. If the further supply is not possible, the next request is not issued and the transaction is ended.