There is provided a controller that performs: determining, based on information obtained from a sensor configured to detect a physical condition of a target person, which of a plurality of predetermined categories the physical condition of the target person falls into; and transmitting a notification corresponding to the physical condition of the target person to a terminal of a notification destination that corresponds to a category into which the physical condition of the target person is determined to fall, wherein terminals of notification destinations are set for the plurality of categories, respectively.