To solve problems such as increase in price and maintenance cost due to necessity of dedicated control circuit, dedicated installation place and man-hour for operation when installing an image photographing device for preventing crimes or provided value-added service to a customer in a store or the like and controlling the device corresponding to a purpose.

This electronic cash register is provided with a photographing device part 1 and an image signal processor part 2 for converting image signals provided there to digital data and the output data of the image signal processor part 2 can be processed in the original data processing circuit part of the electronic cash register. Thus, the data can be displayed on a display device part 6 integrated in the electronic cash register, preserved in a storage device part 7 or transmitted through a communication equipment part 9 to the outside the expansion of the device or increase of cost caused by adding the photographing function can be suppressed, and the man-hour can be suppressed to the minimum by integrating operation with the operation of the electronic cash register as well.