A connecting destination server switch control method for switching a server and the connecting destination of the server is provided, the method realizing a larger-scaled network system by distributing a load to each cache server, thus reducing the total load and dynamically modifying a logical network according to the load of each cache server even when there is a plurality of content servers that are content distributors. In a situation where cache servers whose management sources differ are connected in many steps, the total load caused by content acquisition can be reduced by modifying the content acquisition source server of a cache server for each piece of content.