To provide an inexpensive advertisement information provision system for easily delivering and publishing a simple advertisement in a short sentence form like a classified advertisement with a relatively low cost and for increasing opportunities to be browsed.

The advertisement information provision system comprises a management company managing advertisement data; affiliate Web sites making affiliate contracts for advertisement deliveries with the management company; and clients connected with the Web sites so as to communicate therewith and deliver advertisement application data and advertisement data to the Web sites. The management company manages the application data and the advertisement data from the clients, and the Web sites transfer the application data and the advertisement data between the management company and the clients. The clients may perform advertisement applications and affiliate offers with the management company from screens with the advertisements published thereon, and when the clients applies the advertisements to any Web site, the same advertisements are reflected to other affiliate Web sites.