A device information acquirer acquires device information of each electrical device of a plurality of electrical devices from a control apparatus. A device information display associates and displays on a screen an identifier, an expected installation location, and a device state for each electrical device based on the device information of each electrical device acquired by the device information acquirer. The device information acquirer acquires from the control apparatus the device state information of an electrical device of interest newly collected by the control apparatus after the electrical device installed at the expected installation location of the electrical device of interest is operated by the user. The device information display explicitly shows on the screen whether the device state of the electrical device has changed due to the operation by the user based on the device state information of the electrical device of interest acquired by the device information acquirer.