during copying the portion surrounded by the coordinates indicated by the pen 4 and erase the other portion and denoted by 42 is a switch for instructing to erase during copying the portion surrounded by the coordinates indicated by the pen 4 and record the other portion one of such switches 41 and 42 are selected when the indication by the pen 4 has been terminated in this manner the housing 11 is closed as previously described and a copy start instruction switch 43 is depressed when such instruction is put out a write in instruction is put out from a control circuit 44 to a write in circuit 45 and if the switch 41 is in its on position a digital 34 1 34 is written into the portion surrounded by coordinates p1 p2 p3 and p4 and 34 0 34 is written into the other portion and if the switch 42 is in its on position a digital 34 0 34 is written into the portion surrounded by coordinates p1 p2 p3 and p4 and 34 1 34 is written into the other portion when such write in has been terminated a termination signal is sent from the write in circuit 45 to the control circuit 44 which thus puts out a copy start instruction on a line sl1 and instructs to start movement.