An apparatus is provided, comprising: a storage portion for storing, by each position on a patrol route, an equipment to be inspected in a plant which should be inspected by viewing by a patroller; a position acquisition portion for acquiring a position of a patroller on a patrol route; a first detection portion for detecting a viewed equipment which has been viewed by a patroller; and an alert portion for outputting an alert signal about the viewed equipment, in response to a fact that the equipment to be inspected, which corresponds to a position of a patroller on a patrol route, is not detected as the viewed equipment.