JP2011217054A - Security system, and security method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a security system and method, capable of reducing a period in which the security system is brought into a non-security state.SOLUTION: The security system includes a security device, and a monitoring server connected to the security device, wherein the security device includes: a communication controller connected to a human body sensor arranged in the vicinity of a communication line for connecting the security system to the monitoring server for transmitting, to the monitoring server at predetermined intervals, a disconnection monitoring signal for monitoring whether the communication line is disconnected; a receiver to receive a signal from the human body sensor; and an interval changer to change the predetermined interval at which the disconnection monitoring signal is transmitted based on the signal received by the receiver.

Description

  The present invention relates to a security system and a security method including a security device and a monitoring server connected to the security device.

  Conventionally, there is a security system including a security device that guards a specific security target area and a monitoring server that manages the security device. As a communication line of such a security system, a pay-per-use type communication line such as a general telephone line, an ISDN (Integrated Services Digital Network) line, or a wireless packet communication line is used.

  By the way, in the security system, it is necessary to reliably send a security signal such as a fire alarm, an emergency signal, and an intrusion alarm transmitted from the security device to the monitoring server, and the communication line is required to have very high reliability. However, for example, communication lines or the like wired outdoors may be accidentally blocked by people or small animals.

  Therefore, in the conventional security system, in order to monitor whether or not the communication line is disconnected, a disconnection monitoring signal is transmitted from the security device to the monitoring server at regular intervals. The monitoring server determines that the communication line is communicable when receiving the disconnection monitoring signal at regular intervals (Patent Document 1). In a security system using a pay-per-use communication line, by transmitting a disconnection monitoring signal at regular intervals in this way, it is possible to determine the state of the communication line while reducing the communication cost related to the transmission of the disconnection monitoring signal. Yes.

JP-A-11-136357

  However, in the conventional security system, for example, when a disconnection monitoring signal is transmitted every 3 hours, when the communication line is disconnected immediately after the last disconnection monitoring signal is transmitted, the communication is disabled for a maximum of 3 hours. There was a problem that it was not possible to detect that it had fallen and it became unguarded.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a security system and a security method capable of shortening the period during which no security is established.

  The present invention employs the following configuration in order to achieve the above object.

  The present invention is a security system including a security device and a monitoring server connected to the security device, wherein the security device is provided in the vicinity of a communication line connecting the security device and the monitoring server. Communication control means connected to the human body sensing means and transmitting a disconnection monitoring signal for monitoring whether or not the communication line is broken to the monitoring server at a predetermined interval; and a signal from the human body sensing means Receiving means for receiving, and interval changing means for changing the predetermined interval for transmitting the disconnection monitoring signal based on a signal received by the receiving means.

  Further, the security system of the present invention has area determination means for determining whether or not the human body sensing means is arranged outside the security target area by the security device, and the interval changing means is configured such that the human body sensing means is the When the receiving means receives the signal from the human body sensing means in the case where it is arranged outside the security target area, the predetermined interval is changed.

  In the security system of the present invention, the interval changing unit shortens the predetermined interval after the receiving unit receives the signal from the human body detecting unit.

  Further, in the security system of the present invention, the interval changing unit returns the predetermined interval to the interval before the change when the receiving unit does not receive the signal from the human body detecting unit for a predetermined time after shortening the predetermined interval. .

  Further, in the security system of the present invention, the security device adds a signal indicating the changed predetermined interval to the disconnection monitoring signal transmitted after the predetermined interval is changed by the interval changing unit. Have

  The present invention is a security method by a security system including a security device and a monitoring server connected to the security device, the security device being in the vicinity of a communication line connecting the security device and the monitoring server. A communication control procedure connected to the human body sensing means provided, and transmitting a disconnection monitoring signal for monitoring whether or not the communication line is disconnected by the communication control means to the monitoring server at a predetermined interval; A receiving procedure for receiving a signal from the human body sensing means by a receiving means, and an interval changing procedure for changing the predetermined interval for transmitting the disconnection monitoring signal based on the signal received in the receiving procedure by an interval changing means. And having.

  According to the present invention, in a security communication line for monitoring disconnection, even if the communication line is disconnected for some reason, it is possible to reduce the period during which the communication line is unguarded.

It is a figure explaining the system configuration of the security system of this embodiment. It is a figure for demonstrating the hardware constitutions of the security apparatus of this embodiment. It is a figure for demonstrating the hardware constitutions of the monitoring server of this embodiment. It is a figure explaining the functional structure of the security apparatus and monitoring server which comprise a security system. It is a figure explaining the transmission interval of a disconnection monitoring signal. It is a figure explaining the production | generation of the signal by a signal generation part. It is a flowchart of the security system of this embodiment. It is a figure which shows the example in which the human body detection sensor was provided in the indoor area which is a guard object area | region.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a system configuration of a security system according to the present embodiment.

  The security system 100 of this embodiment is configured by connecting a security device 200 and a monitoring server 300 via a communication line. The communication line is, for example, a telephone line or an ISDN line. The security device 200 may have a wireless communication line 201 and perform wireless packet communication.

  In the security system 100 of the present embodiment, the security device 200 guards a predetermined security target area. In the security system 100 of this embodiment, an indoor area is designated as a security target area by the security device 200, and an outdoor area is designated as a non-security target area.

  The security device 200 according to the present embodiment is connected to a sensor 202 provided in a security target area, and the security device 200 transmits an alarm to the monitoring server 300 when the sensor 202 detects an abnormality. The sensor 202 is, for example, a fire alarm, an intruder sensor, a gas leak alarm, or the like. When an alarm is received at the monitoring server 300, a controller or the like who manages the monitoring server 300 takes a response according to the alarm.

  The security device 200 of this embodiment is also connected to a human body sensor 203 provided outside the security target area. The human body sensor 203 is preferably provided in the vicinity of the communication line.

  When a human body is detected by the human body sensor 203, the security device 200 according to the present embodiment changes the timing at which a disconnection monitoring signal for determining whether or not the communication line is disconnected is transmitted to the monitoring server 300. . More specifically, when the security device 200 senses a human body with the human body sensor 203 outside the security target area, the security device 200 considers that the human body is likely to block the communication line, and transmits a disconnection monitoring signal to the monitoring server 300. Reduce the interval.

  FIG. 2 is a diagram for explaining a hardware configuration of the security device according to the present embodiment. In the security device 200 of this embodiment, an input device 21, an output device 22, a drive device 23, an auxiliary storage device 24, a memory device 25, an arithmetic processing device 26, an interface device 27, and a sensor receiver 28 are connected via a bus B1. Has been.

  The input device 21 is used for operating the security device 200, for example. The output device 22 is, for example, a voice output unit that outputs a warning sound or a display unit that displays a warning message. The drive device 23 drives the program recorded on the recording medium 29 to the auxiliary storage device 24.

  The auxiliary storage device 24 stores the installed security program and stores necessary files, data, and the like. The memory device 25 reads and stores a security program from the auxiliary storage device 24 when the security device 200 is activated. The arithmetic processing device 26 controls the overall processing of the security device 200. Then, the arithmetic processing unit 26 implements various processes as will be described later in accordance with the security program stored in the memory device 25.

  The interface device 27 includes a modem, a LAN card, and the like, and is used to connect the security device 200 to the monitoring server 300. The sensor receiver 28 receives signals from the sensor 202 and the human body sensor 203 provided in the security device 200. The sensor receiver 28 receives an image captured by a surveillance camera connected to the security device 200.

  The security program of the present invention is at least a part of various programs that control the security device 200. The security program is provided, for example, by distributing the recording medium 29 or downloading from the network. The recording medium 29 on which the security program is recorded is information such as a CD-ROM, a flexible disk, a magneto-optical disk, etc., a recording medium for recording information optically, electrically or magnetically, a ROM, a flash memory, etc. Various types of recording media such as a semiconductor memory for electrical recording can be used.

  When the recording medium 29 on which the security program is recorded is set in the driver device 23, the security program is installed from the recording medium 29 into the auxiliary storage device 24 via the driver device 23. The security program downloaded from the network is installed in the auxiliary storage device 24 via the interface device 27.

  FIG. 3 is a diagram for explaining the hardware configuration of the monitoring server of this embodiment. In the monitoring server 400 of this embodiment, an input device 31, an output device 32, a drive device 33, an auxiliary storage device 34, a memory device 35, an arithmetic processing device 36, and an interface device 37 are connected via a bus B2.

  The input device 31 includes a keyboard and a mouse, and is used for inputting various signals. The output device 32 includes a display device and is used to display various windows, data, and the like. The drive device 33 drives the program recorded on the recording medium 38 to the auxiliary storage device 34.

  The auxiliary storage device 34 stores the installed monitoring program and stores necessary files, data, and the like. The memory device 35 reads and stores the monitoring program from the auxiliary storage device 35 when the monitoring server 300 is activated. The arithmetic processing device 36 controls the overall processing of the monitoring server 300. Then, the arithmetic processing unit 36 implements various processes as will be described later in accordance with the monitoring program stored in the memory device 35.

  The interface device 37 includes a modem, a LAN card, and the like, and is used to connect the monitoring server 300 to the security device 200.

  The monitoring program of the present invention is at least a part of various programs that control the monitoring server 300. The monitoring program is provided, for example, by distributing the recording medium 38 or downloading from the network. The recording medium 38 on which the monitoring program is recorded is a recording medium such as a CD-ROM, a flexible disk, a magneto-optical disk, etc., which records information optically, electrically or magnetically, a ROM, a flash memory, etc. Various types of recording media such as a semiconductor memory for electrical recording can be used.

  When the recording medium 38 on which the monitoring program is recorded is set in the driver device 33, the monitoring program is installed from the recording medium 38 to the auxiliary storage device 34 via the driver device 33. The monitoring program downloaded from the network is installed in the auxiliary storage device 34 via the interface device 37. The auxiliary storage device 34 stores the installed monitoring program and stores necessary files, data, and the like.

  Below, with reference to FIG. 4, the function of the apparatus which comprises the security system 100 of this embodiment is demonstrated. FIG. 4 is a diagram illustrating the functional configuration of the security device and the monitoring server that constitute the security system.

  The security device 200 according to the present embodiment includes an area determination unit 210, a sensor reception unit 220, a security state determination unit 230, an interval change unit 240, a signal generation unit 250, and a communication control unit 260.

The area determination unit 210 determines whether or not the sensor 202 connected to the security device 200 and the human body sensor 203 are within the security target area. An IP address is assigned to each of the sensor 202 and the human body sensor 203 connected to the security device 200 of the present embodiment. In the security device 200 according to the present embodiment, for example, a list of sensors installed in the security target area is stored in the auxiliary storage device 24. The area discriminating unit 210 of the present embodiment discriminates whether or not the sensor 202 and the human body sensor 203 are within the security target area based on the sensor list and the IP address of each sensor. , Receiving signals from the sensor 202 and the human body sensor 203. The security state determination unit 230 determines whether or not the security device 200 is in a security state. The security state of this embodiment has two states, a security release state and a security set state.

  The security release state is a state in which the security device 200 is turned off and the security in the security target area is not performed. In the security release state, the security device 200 does not issue an alarm or the like even when sensor inputs from the sensor 202 and the human body sensor 203 are received.

  The security set state is a state in which the security device 200 performs security in the security target area. In the security set state, for example, when the security device 200 receives a sensor input from the sensor 202, the security device 200 transmits an alarm to the monitoring server 300.

  Note that the security device 200 according to the present embodiment transmits a disconnection monitoring signal to the monitoring server 300 at every predetermined transmission interval in both the security release state and the security set state. The disconnection monitoring signal in the present embodiment is a signal transmitted from the security device 200 to the monitoring server 300 at regular intervals in order to confirm that the communication line between the security device 200 and the monitoring server 300 is not interrupted. .

  When the approach of the human body is detected by the human body sensor 203 connected to the security device 200, the interval changing unit 240 changes the transmission interval of the disconnection monitoring signal. Details of changing the transmission interval of the disconnection monitoring signal by the interval changing unit 240 will be described later.

  The signal generation unit 250 adds additional information to the disconnection monitoring signal transmitted after the sensor reception unit 220 receives the human body detection signal from the human body sensor 203. Details of the signal generator 250 will be described later.

  The communication control unit 260 controls communication between the security device 200 and the monitoring server 300 such as transmission of a disconnection monitoring signal.

  The monitoring server 300 includes a database 310, a signal receiving unit 320, a determination interval changing unit 330, and a state determining unit 340.

  The database 310 of this embodiment is provided in the auxiliary storage device 34 of the monitoring server 300, for example, and stores a state determination interval 311. The state determination interval 311 is used by the state determination unit 340 to determine the state of the communication line.

  The state determination unit 340 determines whether or not the communication line is active based on the reception interval of the disconnection monitoring signal. More specifically, when the disconnection monitoring signal reception interval is the same as the state determination interval 311, the state determination unit 340 determines that there is no abnormality in the communication line and the security target area. Also, the state determination unit 340 determines that a disconnection has occurred in the communication line when the reception interval of the disconnection monitoring signal is longer than the state determination interval 311. Further, the state determination unit 340 may determine that some abnormality (abnormality) has occurred in the security target area when the disconnection monitoring signal reception interval is shorter than the state determination interval 311.

  Below, the change of the transmission interval of the disconnection monitoring signal by the interval changing unit 240 of the present embodiment will be described. The interval changing unit 240 of the present embodiment can also change the transmission interval according to the security state, the time zone, and the like.

  For example, when the sensor receiving unit 220 receives a human body detection signal from the human body sensor 203, the interval changing unit 240 of the present embodiment simply shortens the transmission interval of the disconnection monitoring signal. For example, when the transmission interval before receiving the human body detection signal by the sensor receiving unit 220 is 3 hours, the transmission interval is changed to 1 hour from the disconnection monitoring signal transmitted first after receiving the human body detection signal.

  In addition, for example, when the sensor receiving unit 220 receives a human body detection signal from the human body sensor 203, the interval changing unit 240 of the present embodiment transmits a disconnection monitoring signal to the monitoring server 300 by the communication control unit 260. The interval changing unit 240 may shorten the transmission interval from when the disconnection monitoring signal is transmitted when the human body detection signal is received until the next disconnection monitoring signal is transmitted.

  Further, the interval changing unit 240 of the present embodiment may reduce the transmission interval to the original interval again when the sensor receiving unit 220 does not receive the human body detection signal for a predetermined time after shortening the disconnection monitoring signal transmission interval. good.

  FIG. 5 is a diagram illustrating the transmission interval of the disconnection monitoring signal. FIG. 5A is a diagram illustrating an example of the transmission interval of the disconnection monitoring signal, and FIG. 5B is a diagram illustrating an example of the time until the transmission interval of the disconnection monitoring signal is restored.

  In the example of FIG. 5A, the transmission interval of the disconnection monitoring signal in the daytime security release state is 3 hours, and the transmission interval of the disconnection monitoring signal in the nighttime security release state is 1 hour. The transmission interval of the disconnection monitoring signal in the daytime guard set state is 30 minutes, and the transmission interval of the disconnection monitoring signal in the nighttime guard set state is 15 minutes.

  In this way, the interval changing unit 240 of the present embodiment can change the transmission interval of the disconnection monitoring signal according to the time zone and the security state. Note that the disconnection monitoring signal transmission interval is preferably set in advance in the security device 200.

  The example of FIG. 5B shows the time until the disconnection monitoring signal transmission interval is restored again after the disconnection monitoring signal transmission interval is shortened by the reception of the human body detection signal of the sensor receiving unit 220.

  For example, in the daytime security release state shown in FIG. 5A, it is assumed that the sensor reception unit 220 receives a human body detection signal and the transmission interval of the disconnection monitoring signal is shorter than 3 hours. In the security release state, the interval changing unit 240 of this embodiment shortens the transmission interval of the disconnection monitoring signal, and if the sensor receiving unit 220 does not receive the human body detection signal for 30 minutes, the transmission interval of the disconnection monitoring signal is set again. Return to 3 hours.

  In addition, for example, it is assumed that the sensor receiving unit 220 receives a human body detection signal in the night security set state, and the interval changing unit 240 shortens the transmission interval of the disconnection monitoring signal to less than 15 minutes. In the guard set state, the interval changing unit 240 of the present embodiment sets the transmission interval of the disconnection monitoring signal to 15 if the sensor receiving unit 220 does not receive the human body detection signal for 1 hour after shortening the transmission interval of the disconnection monitoring signal. Return to minutes. The time shown in FIG. 5B is also preferably set in advance in the security device 200.

  As described above, the interval changing unit 240 according to the present embodiment can change the transmission interval of the disconnection monitoring signal according to the security state and the time zone.

  Next, signal generation by the signal generation unit 250 of the present embodiment will be described with reference to FIG. FIG. 6 is a diagram illustrating signal generation by the signal generation unit. 6A shows an example of a disconnection monitoring signal in a normal state, and FIG. 6B shows an example of a disconnection monitoring signal to which additional information is given.

  The disconnection monitoring signal 61 shown in FIG. 6A is a confirmation signal for confirming whether a signal can be transmitted from the security device 200 to the monitoring server 300, and is a disconnection monitoring signal in a normal state. . In the monitoring server 300, the state determination unit 340 determines that communication via the communication line is possible when the disconnection monitoring signal 61 is received by the signal reception unit 320 at the same interval as the state determination interval 311.

  The disconnection monitoring signal 61A shown in FIG. 6B is a disconnection monitoring signal after human body sensing, with the additional information 62 added to the disconnection monitoring signal 61 of FIG. 6A by the signal generator 250.

  In this embodiment, when the sensor receiving unit 220 receives a human body detection signal, the signal generation unit 250 receives a human body detection signal and an interval value signal indicating the value of the transmission interval changed by the interval changing unit 240 as a confirmation signal. To the disconnection monitoring signal 61A.

  The communication control unit 260 receives the disconnection monitoring signal 61A to which the additional information 62 is added after the interval changing unit 240 changes the transmission interval of the disconnection monitoring signal by receiving the human body sensing signal by the sensor receiving unit 220. Send to.

  In the monitoring server 300, when the signal receiving unit 320 receives the disconnection monitoring signal 61A with additional information, the determination interval changing unit 330 changes the value of the state determination interval 311 of the database 310 based on the interval value signal included in the additional information 62. To do. With this process, the monitoring server 300 according to the present embodiment can determine the state according to the changed interval even after the disconnection monitoring signal transmission interval is changed.

  The operation of the security system 100 according to this embodiment will be described below with reference to FIG. FIG. 7 is a flowchart of the security system of this embodiment.

  In the security system 100 of the present embodiment, when the sensor receiving unit 220 of the security device 200 receives a human body detection signal from the human body detection sensor 203 (step S701), the area determination unit 210 outputs the human body detection sensor 203. Is determined to be located outside the security target area (step S702).

  When it is outside the security target area in step S702, the interval changing unit 240 changes the transmission interval of the disconnection monitoring signal to the designed change interval (step S703). Subsequently, the signal generation unit 250 generates a disconnection monitoring signal after human body sensing in which the human body detection signal and the interval value signal are added to the normal disconnection monitoring signal (step S704). Subsequently, the communication control unit 260 transmits the disconnection monitoring signal 61A to which the additional information 62 after human body sensing is given to the monitoring server 300 (step S705).

  When the monitoring server 300 receives the disconnection monitoring signal after human body detection by the signal receiving unit 320 (step S706), the determination interval changing unit 330 transmits the changed transmission from the additional information 62 included in the received disconnection monitoring signal 61A. The value of the interval (reception interval) is acquired and overwritten and changed over the state determination interval 311 of the database 310 (step S707).

  Subsequently, when the disconnection monitoring signal is received at the same interval as the state determination unit 340 of the monitoring server 300 and the state determination interval 311 after the change (step S708), it is determined that there is no abnormality in the communication line (step S709). When the disconnection monitoring signal is received at an interval different from the changed state determination interval 311 in step S708, the state determination unit 340 determines that an abnormality has occurred in the security target area (step S710). If the state determination unit 340 receives the disconnection monitoring signal at an interval shorter than the state determination interval 311, the state determination unit 340 determines that there is an abnormality in the security target area, and if the disconnection monitoring signal is not received even after the state determination interval 311, It is determined that the communication line is disconnected.

  In FIG. 7, the security device 200 generates the disconnection monitoring signal 61A to which additional information is added after receiving the human body sensing signal, and then transmits the disconnection monitoring signal 61A to the monitoring server 300. However, the present invention is not limited to this. In the present embodiment, for example, immediately after the security device 200 receives the human body detection signal, the disconnection monitoring signal 61 in the normal state is transmitted to the monitoring server 300, and additional information is added to the disconnection monitoring signal to be transmitted next. good.

  Although not shown in FIG. 7, if the human body detection signal is not received for a predetermined time after the transmission interval is changed, the interval changing unit 240 changes the transmission interval to the original normal interval. At this time, the signal generation unit 250 may generate a disconnection monitoring signal in which an interval value signal indicating a value of a normal transmission interval is added to the confirmation signal, and may transmit the disconnection monitoring signal to the monitoring server 300.

  In the monitoring server 300, when this disconnection monitoring signal is received, the determination interval changing unit 330 overwrites and changes the state determination interval 311 of the database 310 to the original transmission interval.

  As described above, according to the security system 100 of the present embodiment, it is possible to monitor the state of the communication line according to the security status and the time zone by changing the transmission interval of the disconnection monitoring signal.

  In the present embodiment, when a human body detection signal is received by the human body sensor 203 provided outside the security target area, the transmission interval of the disconnection monitoring signal is shortened, so that no security is provided if the communication line is disconnected. It is possible to shorten the period for the state.

  Furthermore, in the present embodiment, after the transmission interval of the disconnection monitoring signal is once shortened, when the human body detection signal is not received for a predetermined time, the transmission interval is returned again to the normal interval. Therefore, in the present embodiment, it is possible to avoid the disconnection monitoring signals from the security device 200 being concentrated and transmitted to the monitoring server 300, and it is possible to contribute to alleviating congestion of the receiving lines of the monitoring server 300. Furthermore, it is possible to reduce communication costs related to the transmission of the disconnection monitoring signal.

  Moreover, although this embodiment demonstrated the example in which the human body detection sensor 203 was installed in the outdoor area outside a guard object area | region, it is not limited to this. In the present embodiment, the human body sensor 203 may be provided in an indoor area that is a security target area, for example, like a security system 100A illustrated in FIG. FIG. 8 is a diagram illustrating an example in which the human body sensor is provided in an indoor area that is a security target area. In this case, the same effect as that of the present embodiment can be obtained.

  In this embodiment, the communication line between the security device 200 and the monitoring server 300 has been described as a pay-per-use type, but this communication line may be a constantly connected line.

  As mentioned above, although this invention has been demonstrated based on each embodiment, this invention is not limited to the requirements shown in the said embodiment. With respect to these points, the gist of the present invention can be changed without departing from the scope of the present invention, and can be appropriately determined according to the application form.

DESCRIPTION OF SYMBOLS 100 Security system 200 Security apparatus 201 Wireless communication line 202 Sensor 203 Human body sensor 210 Area | region discrimination | determination part 220 Sensor receiving part 230 Security state judgment part 240 Interval change part
250 signal generation unit 260 communication control unit 300 monitoring server 310 database 320 signal reception unit 330 determination interval change unit 340 state determination unit

Claims (6)

A security system including a security device and a monitoring server connected to the security device,
The security device
Connected to human body sensing means provided in the vicinity of a communication line connecting the security device and the monitoring server;
Communication control means for transmitting a disconnection monitoring signal for monitoring whether or not the communication line is disconnected to the monitoring server at a predetermined interval;
Receiving means for receiving a signal from the human body sensing means;
An interval changing means for changing the predetermined interval for transmitting the disconnection monitoring signal based on the signal received by the receiving means. The security device
Having an area determination means for determining whether or not the human body detection means is arranged outside the security target area by the security device;
The interval changing means includes
2. The security system according to claim 1, wherein the predetermined interval is changed when the reception unit receives the signal from the human body detection unit when the human body detection unit is disposed outside the security target area. The interval changing means includes
The security system according to claim 1, wherein the predetermined interval after the receiving unit receives the signal from the human body sensing unit is shortened. The interval changing means includes
The security according to any one of claims 1 to 3, wherein after the predetermined interval is shortened, when the receiving unit does not receive the signal from the human body sensing unit for a predetermined time, the predetermined interval is returned to the interval before the change. system.   5. The signal generation unit according to claim 1, further comprising: a signal generation unit that adds information indicating the changed predetermined interval to the disconnection monitoring signal transmitted after the predetermined interval is changed by the interval changing unit. The security system described. A security method by a security system including a security device and a monitoring server connected to the security device,
The security device is connected to human body sensing means provided in the vicinity of a communication line connecting the security device and the monitoring server,
A communication control procedure for transmitting a disconnection monitoring signal for monitoring whether or not the communication line is disconnected by the communication control means to the monitoring server at a predetermined interval;
A receiving procedure for receiving a signal from the human body sensing means by a receiving means;
An interval changing procedure for changing the predetermined interval for transmitting the disconnection monitoring signal based on the signal received in the receiving procedure by an interval changing means.

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