When not the target device accessed by an operator terminal but other devices communicatably connected therewith have problems, the setting operation and the status viewing of the device with a problem are enabled through the target device accessed by an operator terminal. The portable terminal detects the electric appliance connected with a local area network connected with the portable terminal, in response to an instruction from the operator terminal. The portable terminal enables the setting operation and the status viewing of the electric appliance from the operator terminal based on the determined model related information, so that the problem of the electric appliance can be solved.