The invention provides a computer system which is related with a Web server for providing a Web site over the Internet. The computer system is configured to comprise customer type determining means for determining a customer type of a user based on a transition of the user's content requests when the user is accessing the Web site and Web page providing means for providing an appropriate Web page for the user based on the determined customer type. According to the invention, it is possible to determine a customer type of a user while the user is accessing a Web site and present a Web page appropriate to that user based on the determined customer type of the user.