A system using an input integrated flat panel display (5) of an integrated structure, having an input device (3, 13) for inputting through handwriting characters, graphics, or points and a flat panel display (2,12) laid upon the input device for displaying in accordance with an input point data input through handwriting. The frame memory (23) of a large screen having a display screen larger than that of the flat panel display is arranged to be read out through the input device of the input integrated flat panel display. In addition, the read-out contents of the large screen frame memory is arranged to be copied onto the flat display of the input integrated flat panel display. The input integrated flat panel display system can improve the man-machine performance while the amateur end user performs document processings, graphic processings and the like.