PURPOSE : A method for providing valid information through an Internet is provided to improve reliability of information by making an information provider have a strong sense of responsibility for the information.CONSTITUTION : An information provider provides various information such as real estate information, job information and sales information(S1). A server stores the information in a member information database and a goods information database(S2). The server transmits a guaranty money deposit signal to the information provider through an Internet, and the guaranty deposit signal is displayed on a terminal of the information provider(S3). After the server confirms depositing of the guaranty money(S4), the server puts the information of the information provider on a bulletin board(S5). In addition, the server accepts reservation applications from information users interested in the information(S6), and receives personal information and guaranty money deposit account information from the information users(S9). Thereafter, the server maintains a standby mode to perform a reservation process between the information provider and the information user(S10).? KIPO 2002