A first monitoring device is disposed at a predetermined position and configured to monitor a location of an information apparatus that is movable, by performing a radio communication with the information apparatus. A second monitoring device is movable and configured to monitor a location of the information apparatus by performing the radio communication with the information apparatus. An apparatus monitoring device causes the radio communication with the information apparatus to be taken over between the first monitoring device and the second monitoring device, and collects results of monitoring the information apparatus, from the first monitoring device or the second monitoring device which has taken over the radio communication with the information apparatus.