To refer to and compile data in a document data size which is easily viewed while it is reduced as it is for viewing the whole image of electronized document data.

An information processing system is composed of an input device 101 receiving the input of document data and a control code, an input controller 104 controlling the input device 101, a document data information managing part 105 managing information of document data, an enlargement display part 107 which executes a partial enlargement display processing, a part 108 controlling the display position of a KANJI (Chinese character) conversion window, a display control part 106 controlling a display device 102 and the display device 102 displaying various pieces of information.