PROBLEM TO BE SOLVED: To provide a device for monitoring a person to be monitored capable of more properly determining a condition of a person to be monitored, a method and a system thereof.SOLUTION: The invention relates to a device for monitoring a person to be monitored for notifying a terminal device of an event notification communication signal for notifying of an event which stores event information indicating a content of a prescribed event related to a person to be monitored who is a monitoring object and an image of the person to be monitored related to the event, the terminal device being connected so as to communicate. As one example of the device, a management server device SV has: a behavior information processing part 223 for determining behavior information related to a prescribed behavior of the person to be monitored a behavior information storage part 234 for associating the behavior information with the person to be monitored and storing the same and a TA monitoring processing part 222 for sending the event notification communication signal to the terminal device. The monitoring processing part 222 stores behavior information stored in the behavior information storage part 234 which was determined previous to the time when the event notification communication signal is sent, in the event notification communication signal, when sending the event notification communication signal.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2017,JPO&INPIT【課題】本発明は、より的確に被監視者の状況を判定できる被監視者監視装置、該方法および該システムを提供する。【解決手段】本発明は、監視対象である被監視者に関わる所定のイベントの内容を表すイベント情報および前記イベントに関わる被監視者の画像を収容した、前記イベントを通知するためのイベント通知通信信号を、通信可能に接続された端末装置へ通知する被監視者監視装置である。その一例としての管理サーバ装置SVは、被監視者における所定の行動に関する行動情報を求める行動情報処理部223と、これを前記被監視者に対応付けて記憶する行動情報記憶部234と、前記イベント通知通信信号を前記端末装置へ送信するTA監視処理部222とを備え、監視処理部222は、前記イベント通知通信信号の送信の際に、その送信時点よりも過去に求められた、行動情報記憶部234に記憶されている行動情報を、前記イベント通知通信信号にさらに収容する。【選択図】図3