PURPOSE : To obtain a map of nearly actual size similar to a map prepared at a registry office without taking the trouble to visit the registry office by displaying information on the map of nearly actual size, the land number, and the owner corresponding to the land number. CONSTITUTION : On the map in the work sheet 1, roads and lands (2a and 2b) for housing or business are displayed distinctively by householders. In the sections 2a and 2b by the householders, land numbers such as ' 3-5' and ' 3-6' are displayed. Further, owner' s names 3a and 3b are displayed in several optional sections. Those are displayed so as to facilitate the matching between the map (official map at registry office) in the sheet 1 and a housing map put on the market. For the purpose, a name of the map in the sheet 1 is collated with the resident names in the housing map on the market to easily search for the place in the housing map corresponding to the map in the sheet 1.