A plurality of service servers, which accept service requests from clients via a Web server connected to the Internet and render services, are connected to a service managing server distributing the service requests. The service servers are divided into groups for a plurality of levels depending on the quality of a rendered service. Furthermore, a service server that is called an intermediate server and can change the quality level of a rendered service is arranged in addition to the above described levels. If the load on a service server of a group on any of the levels increases, the service managing server uses the intermediate server as a server of that group, so that the load on the group is reduced. As a result, loads are made even among the groups, and the qualities are maintained.