Abstract: A facility management local server is provided with a proxy work management unit that is communicatively coupled to a proxy management center server. If an error code is output while maintenance work that results in a change in a set value stored in a set value storage unit is being performed in a building to be maintained, the proxy work management unit allows proxy maintenance work to be performed via remote control from a maintenance worker terminal device that is communicatively coupled to the center server. Further, the proxy work management unit can display, on display units provided in the building to be maintained, a proxy request screen including an error code input field and an input field for receiving an input of the content of the maintenance work that was being performed in the building to be maintained when the error code was output.