To provide a rental housing information system that can develop new demand for rental housing by means of communication lines such as the Internet and reflect it in rental housing supply planning and rental housing remodeling planning.

A search condition setting part 9 sets as fixed conditions any two conditions of location condition information, building condition information and rent condition information stored in a location condition DB 2, a building condition DB 3 and a rent condition DB 4, and sets as a search condition the other one condition. A search part 10 makes a search, and a display/output/input part 11 outputs and displays the results.