A user system includes a log read-out section for reading out setting state log data, a log data sending section for sending the setting state log data, and a restoration operation activating section for receiving a restore command and performs a restoration operation. A remote operation system includes a log data receiving section for receiving the setting state log data, a log data analyzing section for analyzing the setting state log data, a communication requesting section for requesting sending of the setting state log data, and a restore command sending section for sending a restore command.