| 摘要 |
Upon the sale of merchandise by a vending machine, encrypted point information expressing prescribed points is presented to a user. The user transmits the presented point information, together with identification information for the user, to a center device by means of the user's portable telephone set. The center device decrypts the transmitted and encrypted point information, stores and manages points corresponding to the point information for the user, and offers prescribed service to the user based on the points stored and managed for the user.
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