To simplify a program by separating the program from picture data and to make it possible to simply change the program only by changing a registered database at the time of changing a menu or adding/deleting hierarchy.

The contents of a menu database are read out (S21), necessary information is entered and a picture (menues) is displayed (S22). Then which menu is selected is checked. Concretely whether a number '1' is selected or not is checked (S3), and when the number '1' is selected, processing defined in the database is executed (S24). When the display of an order processing menu is proposed, a succeeding menu is concretely displayed. The picture display indicates the order processing menu, and concretely order registration, order change, order chancel, and printing processing are respectively expressed by '1', '2', '3', and 'n'.