PROBLEM TO BE SOLVED : To provide a real-estate lease support system for allowing a tenant and a real-estate company to systematically take procedures including a search for a leasehold property, contract, move-in process, rent payment, and a renewal/move-out process in a credit-card-based secure Web environment so as to provide rational rent guarantee that cannot be achieved by the conventional system of deposit and a cosigner. SOLUTION : A card network integrating means using a center server connected by a network to single terminals installed in a plurality of card companies on one hand and in a plurality of real-estate companies on the other hand is provided. The center server includes a property investigation system for investigating and accumulating property information; a property search system for disclosing and searching for the property information and providing answers; a charge collection support system including a contract registering means for registering information about contracts with tenants, a tenant investigating means for investigating the credit of each tenant, a card settlement integrating means for performing integrated withdrawal of rents, a CTI demand and collection means, and a charge subrogation payment means using the guarantee charges of tenants as resources; and a renewal/move-out process system. COPYRIGHT : (C)2007, JPO&INPIT