PROBLEM TO BE SOLVED : To provide a real estate information management system, a real estate information management method, and a real estate information associating program for allowing easy selection of a desired property and smoothly promoting a lease cycle of properties.SOLUTION : This real estate information management system 10 is provided with a property database 21 constructed of property information about a building, a room, and an owner and associating information, a tenant database 22 constructed of tenant information about a tenant and relocation and associating information, and a real estate information database 31 associating the property information and the tenant information with each other based on the associating information. When a property can be introduced to a lease wisher at the point of generation of a relocation need arising in a registered tenant, a property selection range can be widened, and a period of a vacancy of the property can be reduced since a property having possibility of a vacancy is set as a selection target as soon as possible.COPYRIGHT : (C)2008, JPO&INPIT