This is a sales support system that has its own property database specialized for real estate brokerage and automatically proposes properties that meet the customer's desired conditions from that database. For sellers and potential sellers who have made inquiries (responses) from bulk appraisal sites or the company's own website, the system automatically proposes examples of nearby properties for sale or similar apartments for sale from the unique property database, matching the property for sale, thereby supporting the building of continuous relationships with customers.