A relay server generates a search condition in accordance with a connection request from the first terminal, and requests so that a management server searches for a state of the first terminal; when device information of the first terminal which is transmitted from the management server in response to the request is obtained, generates relay information and transmits the relay information to the first terminal; and controls communication between the first terminal and the second terminal in accordance with the relay information. The management server searches for state information of the first terminal in accordance with the requested search condition, and communicates the state information to the relay server as the device information; and in accordance with receiving the relay information from the first terminal, transmits the relay information to the second terminal.