Information input device, control method thereof and image processing apparatus

A method of controlling an information input device that includes a display unit that has a display screen and displays an image on said display screen, and an input unit that is arranged on said display screen and specifies a designated position on said display screen, comprising the steps of:

• controlling said display unit to display any of first, second and third screen images depending on state of said information input device;
• and
• displaying said first or third screen image when a prescribed key is pressed;
• wherein
• said first and third screen images both have a prescribed area displaying information including the same character, sign or figure, displayed in a predetermined size at a predetermined position;
• said method further comprising the steps of:
• displaying said second screen image when a position in said prescribed area is specified by said input unit while said first screen image is being displayed;
• and
• maintaining display of said third screen image when a position in said prescribed area is specified by said input unit while said third screen image is being displayed.