PURPOSE : A real estate transaction system using the Internet is provided to secure a legal, a systematizing, and an object transaction stability by obtaining a specialized organ and a specialist and provide an available analyzing information.CONSTITUTION : Real estates to sell are collected and a database with respect to a real estate information is established. A user access an Internet and selects a special item among items classified by fields having a purchase and sale, a lease, and an auction. The user selects a detailed information classified by areas, kinds, money amount levels, and investing kinds of a corresponding item. When the user selects a special article for sale, a moving picture information having a geographical information, a cyber model house, an object picture, a moving picture object, or an area information is outputted. When the user selects a special article for sale, an item classified by fields having an interior, a management state, a right relation, a propriety of a current use state, a value increase surplus strength, a transaction cost change, or a neighboring area development schedule is outputted. When the user selects a special article for sale, a real estate transaction is performed.? KIPO 2002