In the monitored person monitoring apparatus, the method and the system according to the present invention, the first physical state of the monitored person is determined based on the image data of the monitored person, and based on the physiological data of the monitored person When the second physical condition of the monitored person is determined and it is determined that one of the first and second body conditions is not in the abnormal state, the one is re-judged and again judged by the one person Whether or not to notify that the monitored person is in an abnormal state is determined based on a determination result of one of the first and second body conditions.本発明にかかる被監視者監視装置、該方法および該システムでは、被監視者の画像データに基づいて前記被監視者の第1身体状態が判定され、前記被監視者の生理学的データに基づいて前記被監視者の第2身体状態が判定され、前記第1および第2身体状態のいずれか一方が異常状態ではないと判定された場合、前記一方が再判定され、前記一方によって再判定された前記第1および第2身体状態のうちの一方の判定結果に基づいて前記被監視者が異常状態である旨を通知するか否かが判断される。