PURPOSE: To install a display part in such a position irrespective of the installation position of a device main body that customers can easily recognize visually the display contents by enabling the display part to be separated from the device main body and receiving and displaying the display data transmitted from the main body.

CONSTITUTION: A display part 2 is provided with a display device 11 which is freely rotatably supported around a support base 14 by a support 15 and can be freely separated from a main body 1 and is installed in an arbitrary position. The display part 2 is provided with a reception antenna 12 to receive the display data transmitted from a transmission antenna 8 of the main body 1. The display part 2 is provided in a manner of being freely attachable and detachable with a charging battery 13, and power supply from this battery 13 is received to drive the display device 11. Thus, the device main body 1 is installed in consideration of the workability of an operator and the space efficiency in a store, and the display part 2 is installed in a position of customer' s high visual recognizability, separately from the main body, and the space in the store is effectively used and the service for customers is improved.