An object of the invention is to reduce necessary costs in a merchandise retail store, and to reduce customer inconvenience and waiting time. A customer entering a merchandise retail store borrows a RFID portable terminal at the store entrance. The customer selects a sample commodity from a store sales area, and a commodity code is read out from a wireless tag in a wireless tag label and stored with the RFID portable terminal, which simultaneously relays that information to the outside. An information-processing apparatus in the store receives this message, and prepares the commodity that the customer wishes to purchase. The customer returns the RFID portable terminal to the sales counter, settles payment, and receives his wrapped commodity.