To provide a system capable of shortening time to be consumed up to return to a seat after finishing business when a user leaves his (or her) seat during the provision of service to a customer and capable of strengthening security when the user leaves the seat.

In utilizing a communicator terminal connected to another IC tag reader on a moving destination, a portable phone with an IC tag which is carried by a user is brought into slight contact with or brought close to an IC reader connected to a communicator terminal being used at present to stop its use through the IC tag reader connected to the communicator terminal, and when the portable phone with the IC tag is brought into slight contact with or brought close to an IC tag reader, a communicator terminal of a moving destination is made a usable state through an IC tag reader and a picture utilized by the communicator until now is displayed.