1. An advertisement system on the Internet including an advertisement server site and at least one partner web site which provides a web page on the Internet and contains e-mail addresses of affiliate users, the advertisement server site comprising: (a) a first database for storing advertisement banners with respective identifications; (b) a second database for storing detailed advertisement contents each having the same identification as that of one of the advertisement banners stored in the first database, the advertisement contents thereby being linked with the banners, respectively; (c) means for providing the partner web site with at least one advertisement banner stored in the first database, the banner being carried on the web page provided by the partner web site; (d) means for receiving an identification of the banner and an e-mail address of an end-user from the partner web site, when the web page of the partner web site is browsed at the end-user terminal and the banner is clicked on; and (e) means for retrieving advertisement content having the same identification as the received one and delivering it to the user terminal having the received e-mail address by e-mail.