User dependent control of the transmission of image and sound data in a client-server system

摘要

A server system having a main proxy server and a mirror server, wherein the main proxy server includes a unit for acknowledging an access by a user; a detecting unit for detecting the conditions of the main proxy server and the mirror server; and a judging unit for judging, from the conditions of the main proxy server or the mirror server detected by the detecting unit, whether data is to be transmitted to the user from the main proxy server or from the mirror proxy server; and a transmitting unit for transmitting data to the user.