PURPOSE: To surely prevent goods from being illegally taken out, by providing an entrance gate which allows passing only in a direction toward a counter, and an exit gate which is opened only when a payment at a trade terminal device is completed.

CONSTITUTION: When a sensor 21 provided at an entrance gate 2 detects a client outside of a shop 1, the entrance gate 2 is only once opened toward the shop 1. When the client selects a trade through manipulation of a keyboard of a trade terminal device 4 with the use of a card or a cash, a CRT of the trade terminal device 4 displays a procedure to be done by the client. Further, the payment is completed, the trade terminal device 4 opens an exit gate 3. Accordingly, a client can exits the shop only when he completes his payment.