A self-service POS terminal device comprises a first antenna and a second antenna, and reads, via each of the first antenna and the second antenna, commodity-related information stored in IC tags of commodities. The first antenna is positioned at a position for reading the IC tags of the commodities loaded in a shopping basket at a prescribed position, and forms a first reading area. The second antenna is positioned at a position for reading the IC tags of the commodities taken out from the shopping basket at the prescribed position and put into a shopping bag, and forms a second reading area.