Abstract: A system comprising: a server for receiving operation information from a client, performing an information process in accordance with the received operation information, and transmitting the result of the information process; and a managing device. The managing device monitors whether communication is performed between the client and the server and transmits an operation mode switching request to the server so as to switch the server operation mode to a power saving mode requiring less power consumption than the current operation mode if no communication is performed. The server receives the operation mode switching request transmitted from the managing device and switches the server operation mode to the power saving mode in accordance with the operation mode switching request.