PROBLEM TO BE SOLVED : To relax the strictness of software which manages real properties and to improve the operability. SOLUTION : A factor specifying one building is inputted from an input means 1. A control means 2 receives it and requests an object image editing means 4 to perform a process. The object image editing means 4 reads real property object information included in the determined building out of a storage means 3, generates an image of the building, and sends a display instruction to a display means 5. The display means 5 on receiving the display instruction displays the image of the building. Thus, the image of the building is displayed.