To input an arbitrary identification number without oversize of an operation box.

After an open key 10a, a stop key 10b and a close key 10c provided on an operation box 10 are pushed down and numeral input operation is performed, the stop key 10b to which a figure cutting function is assigned is pushed down and figure cutting operation is performed. Thereby a key input processing circuit provided in a control panel 9 discriminates the numeral input operation, the numeral input by the numeral input operation is added and recognizes it as the numeral of an identification number of the figures.