| 摘要 |
A person detector (211) detects a person in an area facing one surface of a door. An open and close detector (212) detects whether the door is in an open state or in a closed state. When a state of the door detected by the open and close detection sensor (212) switches from a closed state to an open state, an open-state person detection information recorder (213) records whether the person detector (211) is detecting a person or not. When the state of the door detected by the open and close detection sensor (212) switches from the open state to the closed state, a closed-state person detection information recorder (214) records whether the person detector (211) is detecting a person or not. A room entry and exit detector (215) detects that there occurs an entry into the room and there occurs an exit out of the room on the basis of a content recorded by the open-state person detection information recorder (213) and the closed-state person detection information recorder (214). |
