Cooperative cache method and contents providing method and using request proportion apparatus

PURPOSE: A cooperated cache method and a contents supplying method using a request allotting apparatus for managing an allocation history of cache servers are provided to rapidly cope with the contents transmission request of a client by controlling the cooperated cache between cache servers. CONSTITUTION: A request allotting apparatus collects and manages allocation history information about a cache server within cache clusters. The request allotting apparatus recognizes a load grade of a first cache server holding a first cache server(S504). The request allotting apparatus recognizes the cache server under critical object service load by using the critical load leveling information(S505).