PROBLEM TO BE SOLVED : To provide a map information system including real estate price information in which price information of real estate such as a land or a building is additionally stored on the map information stored as electronic information and the real estate price information is displayed on the map of an electronic screen.SOLUTION : The map information system in which the real estate price information is displayed on the map of the electronic screen is constituted of a process to prepare a map to be made into electronic information, a process to make a map indicating real estate price information into the electronic information, a process to store the electronic map and real estate price map, a process to optionally divide the map information in each page and give a code (a lot number) to the divided parts, a process to correct reduction scale factor, a process to match/display a plurality of corrected map information on the corrected map, and a process to retain the map information with information of both maps.