To speedily display a map desired by a user while reducing the time and the labor required for input.

A zip code is inputted by the user. Address information corresponding to the inputted zip code and address information inputted by the user are displayed on a display device. Then the user is urged to input detail address information, address information more detailed than the displayed address information. It is inputted via an input device to display the address information corresponding to the zip code and a map corresponding to the detail address information on the display device.