PURPOSE: To provide the POS device with a security function for reading an ID card by a door control part and controlling opening and closing of a door, and transmitting and receiving door opening/closing information by radio.

CONSTITUTION: The device is provided with a means for connecting the POS device 1 and a door controller 2 with an ID card reader by radio and executing a communication. Also, this device is provided with a means for registering in advance member information (member NO, qualification, etc.) in a memory 2-3 of the door controller 2, reading an ID card of an entering/leaving person by the ID card reader, collating and deciding its card information and the registered member information, opening and closing the door in the case its card information conforms to opening and closing of the door, transmitting its opening/closing information to the POS device 1 and recording it. By this means, only a specific ID card holder can open and close the door. Moreover, this device is provided with a central monitor 4, and a means which is connected to the POS device 1 by radio, and monitors and records the door opening/closing information.