Articles are placed in a commodity placement area thereby to acquire figure images of the articles, based on stored data acquired from wireless tags respectively attached to the articles. The acquired image forms are developed and displayed in X-axis and Y-axis directions in a display area of a display. A commodity registration screen that enables the choice of each article by an operation at a touch panel, e.g., a registration method selection dialogue, a voice registration dialogue, selection candidates, etc. are displayed on the display.