PROBLEM TO BE SOLVED: To prevent unpaid medical expenses. A medical service trading device 100 causes a user who uses a medical institution to purchase a medical service of the medical institution by using an electronic commerce environment. The usage request receiving unit 120 receives a usage request including a user identifier that identifies a user and a medical institution identifier that identifies a medical institution. The amount presentation unit 140 presents a prepaid amount predetermined by the medical institution. When the settlement unit 150 acquires the settlement request for the prepaid amount from the user, the settlement unit 150 executes the settlement of the prepaid amount by the settlement method registered in advance by the user, and notifies the settlement completion notification indicating that the settlement is completed. [Selection diagram] Fig. 2
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