To provide an advertising system that allows customers to improve the performance for searching for an advertisement, affords an efficient process for purchasing commodities allows an advertiser to determine the bidding price level of an advertisement according to its requesting appeal level to customers, improves the convenience to both customers and advertisers, allows advertisers not only to place an advertisement but also to collect customers' application information to negotiate with customers if needed, allows customers to check a commodity to be purchased by considering the usefulness and the like of more essentially necessary commodity itself, allows customers to judge suitableness of the commodity or the like more objectively, and allows the advertiser to negotiate in safety in an electric meeting room.

The advertising system 10 includes a commodity database DB16 for storing and controlling commodity information for every commodity ID, an advertisement database DB15 for storing and controlling advertising information for every commodity ID and every advertisement ID, and an advertising object database DB10 for storing and controlling advertising object information for every commodity ID, every advertisement ID and every advertising object ID.