1. A handwritten character input device recognizing a handwritten character and outputting a code corresponding to the recognized handwritten character to a prescribed application program, comprising: input means for inputting a handwritten character; display means for displaying a first window displayed by said application program on a prescribed display screen; and setting means for setting a second window in the whole area of said display screen allowing input of a handwritten character at an area overlapping said first window with a display content of said first window viewable through said second window.