To provide a computer system for performing a new affiliate program for increasing the generation of transaction.

This affiliate advertisement management system is configured to manage the information of a second affiliate site carrying second advertisements relating to a first affiliate site carrying first advertisements cooperatively with a WWW server which discloses the first affiliate site, and to acquire second affiliate ID from a browser terminal accessing the first affiliate site, and to make the browser terminal send the ID of the first and second affiliates to an advertiser server when a link set in the first advertisements is instructed by the browser terminal, and to receive first transaction information relating to transaction in an advertiser site disclosed by the advertiser server, and to transmit second transaction information including the second affiliate ID in the information to a predetermined computer.