The monitoring device (100) acquires a plurality of captured images including the target object, and calculates a movement amount of the target object based on a difference between the acquired plurality of captured images. The monitoring device (100) makes a notification regarding the delivery sign of the object according to the amount of movement of the object in a predetermined time width.監視装置（１００）は、対象物を含む複数の撮像画像を取得し、取得した複数の撮像画像間の差分に基づいて、前記対象物の移動量を算出する。監視装置（１００）は、所定の時間幅における前記対象物の移動量に応じて、対象物の分娩兆候に関する通知を行なう。
