An exemplary object of the present invention is to suppress the load on each server and network traffic. To achieve this, a plurality of connection management servers are installed so that any of the connection management servers executes acceptance of a connection request from a thin client terminal. Further, the connection management servers manage the states of clients in order to hold the states of the respective clients, and each of the connection management servers searches a client that can be connected by the thin client terminal according to a connection request from this thin client terminal, and replies with the search result to the thin client terminal, and a range of the connection management servers for executing the search of the client is limited for each connection request from the thin client terminal to the thin client server.