PURPOSE: To perform input even by an operator other than an expert in real time by selecting a processing menu by displaying on electronic paper.

CONSTITUTION: An operating part 101 is constituted of the panel of sensors arranged in micro matrix shape, and is arranged on the upper part (surface) or the lower part (back side) of a display part 102, and a character displayed on the display part 102 or a position where a pen is operated by a frame are regulated. When the character is entered by using an electronic pen 100 on the electronic paper 10 providing with the operating part 101 being overlapped with the display screen, the character recognition of a hand-written character is performed by a recognition part 14 and it is displayed on the display part 102 of the electronic paper 10, and a recognized character is sent to a host device providing with a file by performing a confirming operation by observing a displayed content. In such a way, the input can be performed by the operator other than the expert in real time.