To quickly fix a treatment appointment that can be made at a user's first choice medical institution at the user's desired time or otherwise quickly fix the user's alternative treatment appointment at another medical institution matching the user's needs.

If a user's first choice medical institution has a free slot at a desired treatment time, the user's treatment appointment at the first choice medical institution is accepted and the successful appointment is displayed on a client device 31. Otherwise, a medical institution information management database 25 is searched for alternative medical institutions capable of treatment on the user's desired conditions and a treatment appointment information management database 26 is searched for free slots at the desired treatment time, and introduction information about alternative medical institutions that meet the user's desired conditions and has any free slots is displayed on the client device 31. When a treatment appointment at any alternative medical institution is requested, the user's treatment appointment at the alternative medical institution is accepted and the successful appointment is displayed on the client device 31.