Security systems and security methods

Abstract

It detects intruders without falsely detecting animals. [Solution] The security system includes a sensor that detects radio waves emitted from information terminals within the managed area, a processing unit that determines whether or not there is an intruder in the managed area based on the radio waves detected by the sensor, and an output unit that outputs intruder information to notify the system of the presence of an intruder if it is determined that an intruder is present.

Description

Technical Field

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[0001] The present invention relates to a security system and a security method.

Background Art

[0002] To suppress the damage caused by frequent thefts of agricultural crops, many security devices have been devised so far. For example, Patent Document 1 discloses a security unit that detects an illegal intruder with a plurality of sensors, emits signals to a plurality of security devices, instantly notifies an abnormal situation, and gives a warning to the intruder. Also, Patent Document 2 discloses a security alarm device that detects and reports a person who has illegally entered a large farm where expensive fruits and agricultural crops such as cherries are cultivated.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, with a general human sensor or the like, it is impossible to accurately discriminate whether it is an animal or a human. Therefore, in the above-described technology, even when an animal enters, it may be regarded as an intruder, and incorrect notifications and warnings may be given.

[0005] The present invention has been made in view of such circumstances, and an object thereof is to provide a security system and a security method capable of detecting an intruder without erroneously detecting an animal.

Means for Solving the Problems

[0006] To solve the above-mentioned problems, one aspect of the present invention is a security system comprising: a sensor that detects radio waves emitted from an information terminal within a managed area; a processing unit that determines whether or not there is an intruder in the managed area based on the radio waves detected by the sensor; and an output unit that outputs intruder information to notify the presence of an intruder when it is determined that an intruder is present.

[0007] Furthermore, one aspect of the present invention is a crime prevention method in a crime prevention system, comprising the steps of: a sensor detecting radio waves emitted from an information terminal within a managed area; a processing unit determining whether or not there is an intruder in the managed area based on the radio waves detected by the sensor; and an output unit outputting intruder information to notify that an intruder is present when it has determined that an intruder is present. [Effects of the Invention]

[0008] As explained above, this invention makes it possible to detect intruders without falsely detecting animals. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic block diagram showing the configuration of the security system according to this embodiment. [Figure 2] This flowchart shows an example of the processing flow in the sensor device according to this embodiment. [Figure 3] This is a sequence diagram illustrating the operation of the security system according to this embodiment. [Figure 4] This diagram illustrates a method for locating an intruder using multiple sensors. [Figure 5] This is an image illustrating an example of a notification screen that displays the location of an intruder. [Modes for carrying out the invention]

[0010] A security system and security method according to one embodiment of the present invention will be described below with reference to the drawings.

[0011] <Configuration of Security System 1> Figure 1 is a schematic block diagram showing the configuration of the security system 1 according to this embodiment. The security system 1 is an information processing system that detects and notifies of intruders in the managed area. The managed area is, for example, a farm, a pasture, a solar power plant, a field, a rice paddy, land, etc. However, the managed area is not limited to these examples and may be, for example, a factory, a warehouse, an office, a shop, or a private home. The security system 1 comprises a sensor device 10, a server 20, and a warning device 30. The sensor device 10, the server 20, and the warning device 30 communicate via a network NW by wired or wireless means and are connected to each other so that they can send and receive various kinds of data.

[0012] The network (NW) may be any or a combination of the following: the Internet, a Public Land Mobile Network (PLMN), a Local Area Network (LAN), or a Virtual Personal Network (VPN).

[0013] <Configuration of sensor device 10> The sensor device 10 is a sensor that detects intruders who have entered the managed area. The sensor device 10 is installed, for example, within the managed area, near the boundary of the managed area (for example, near an entrance / exit), or around the managed area. The sensor device 10 comprises a sensor 110, a control unit 120, and a communication unit 130.

[0014] Sensor 110 detects radio waves emitted from information terminals within the managed area. Information terminals include, for example, personal computers, tablet devices, and mobile phones (including so-called smartphones). The radio waves detected by sensor 110 are, for example, communication signals (data communication signals) for wirelessly transmitting and receiving data. The radio waves detected by sensor 110 may also be, for example, request signals or response signals for communication connection. The communication standard can be any wireless communication, such as WiFi (registered trademark), Bluetooth (registered trademark), LPWA (Low Power Wide Area), fifth-generation mobile communication systems (so-called 5G), NFC (Near Field Communication), RFID (Radio Frequency Identification), etc. Sensor 110 is installed so that its detection range is within the managed area. For example, sensor 110 may be installed within the managed area to prevent false detection of radio waves emitted from outside the managed area.

[0015] This embodiment will be explained using the detection of WiFi® or Bluetooth® radio waves as an example. For example, when the communication standard is WiFi®, sensor 110 detects probe requests, etc., transmitted from an information terminal. In this case, sensor 110 operates as, for example, a wireless LAN (Local Area Network) access point. Also, when the communication standard is Bluetooth®, sensor 110 detects advertisements or beacons, etc., transmitted from an information terminal. In this case, sensor 110 operates as a central (master), peripheral (slave), or beacon device.

[0016] The control unit 120 has the function of controlling the overall operation of the sensor device 10. The control unit 120 is realized, for example, by causing the processor (e.g., MCU (Micro Controller Unit) or CPU (Central Processing Unit)) provided as hardware in the sensor device 10 to execute a program. The control unit 120 comprises a processing unit 121 and an output unit 122.

[0017] The processing unit 121 determines whether or not there is an intruder in the managed area based on the radio waves detected by the sensor 110. For example, the processing unit 121 determines whether or not there is an intruder in the managed area based on the strength of the detected radio waves (RSSI (Received Signal Strength Indicator)). The processing unit 121 also determines that there is an intruder in the managed area if the sensor 110 continues to detect radio waves for a predetermined period of time or longer. The predetermined period is, for example, the period of time during which it can be assumed that the intruder is performing work within the managed area. More specifically, the processing unit 121 determines that there is an intruder in the managed area if the sensor 110 continues to detect radio waves of a predetermined strength or higher for a predetermined period of time or longer, and determines that there is no intruder in the managed area otherwise. "Continuing for a predetermined period of time or longer" means that the state of radio waves arriving repeatedly at regular intervals continues for a predetermined period of time. Furthermore, the predetermined intensity is an intensity that allows us to assume the presence of an information terminal within the managed area, based on the managed area, the installation location of the sensor 110, and the distance from the sensor 110 determined from the radio wave intensity. For example, the predetermined intensity is an intensity that allows us to assume the presence of an information terminal in the vicinity of the sensor 110.

[0018] The output unit 122 outputs intruder information to notify that an intruder is present within the managed area when it determines that an intruder is present. The intruder information includes the date and time of the intruder detection, and radio wave information related to the detected radio waves (e.g., radio wave strength and data contained in the communication signal). More specifically, the output unit 122 transmits the intruder information to the server 20 and the warning device 30 via the communication unit 130.

[0019] The communication unit 130 has a function of transmitting and receiving various types of information. The communication unit 130 communicates with an external device through a wired connection or a wireless connection.

[0020] <Configuration of Server 20> The server 20 is a computer that comprehensively controls the security system 1. When the sensor device 10 detects an intruder in the management target range, the server 20 notifies the administrator of the management target range and others that there is an intruder. The server 20 includes a communication unit 210, a control unit 220, and a storage unit 230.

[0021] The communication unit 210 has a function of transmitting and receiving various types of information. The communication unit 210 communicates with an external device through a wired connection or a wireless connection.

[0022] The control unit 220 has a function of controlling the overall operation of the server 20. The control unit 220 is realized, for example, by causing the CPU (Central Processing Unit) included in the server 20 as hardware to execute a program. The control unit 220 includes a notification unit 221.

[0023] The notification unit 221 receives intruder information from the sensor device 10 via the communication unit 210. Based on the received intruder information, the notification unit 221 notifies an external information terminal that there is an intruder in the managed area. This notification may include the date and time of the intrusion and information about the sensor 110 that detected the intruder (e.g., the location and name of the sensor 110). For example, if the managed area is a farm, the notification unit 221 sends an email or message to the information terminal used by the farm manager (e.g., the farm owner) notifying them of the presence of an intruder. Alternatively, the notification unit 221 may display a screen notifying the manager of the presence of an intruder on the information terminal used by the manager. Alternatively, the notification unit 221 may notify the manager of the presence of an intruder by outputting a warning sound or vibration to the information terminal used by the manager. The notification unit 221 may also notify the police or local government information terminal. The information terminals to which notifications are received are pre-configured on the server 20. The recipients of notifications may be changed by the manager or other relevant parties. The notification unit 221 writes the received intruder information to the storage unit 230.

[0024] The storage unit 230 has the function of storing various types of information. The storage unit 230 is composed of storage media provided as hardware by the server 20, such as HDD (Hard Disk Drive), SSD (Solid State Drive), flash memory, EEPROM (Electrically Erasable Programmable Read Only Memory), RAM (Random Access read / write Memory), ROM (Read Only Memory), or any combination of these storage media. For example, the storage unit 230 stores intruder information within the managed scope. In other words, the storage unit 230 stores a history (log) of intruders who have entered the managed scope.

[0025] <Configuration of warning device 30> The warning device 30 is a device that issues a warning to an intruder when the sensor device 10 detects an intruder in the managed area. The warning device 30 comprises a communication unit 310, a control unit 320, and a warning unit 330.

[0026] The communication unit 310 has the function of sending and receiving various types of information. The communication unit 310 communicates with external devices via wired or wireless connection.

[0027] The control unit 320 has the function of controlling the overall operation of the warning device 30. The control unit 320 is implemented, for example, by causing the processor (e.g., MCU (Micro Controller Unit) or CPU (Central Processing Unit)) that the warning device 30 has as hardware to execute a program. For example, the control unit 320 receives intruder information from the sensor device 10 via the communication unit 310. Then, based on the received intruder information, the control unit 320 causes the warning unit 330 to send a warning.

[0028] The warning unit 330 issues a real-time warning (alert) to intruders using warning sounds, displays, vibrations, lights, etc. For example, the warning unit 330 may issue a warning by illuminating warning lights or lights installed in or around the managed area. Alternatively, the warning unit 330 may display a warning message such as "No Entry" on a display device installed in or around the managed area. Furthermore, the warning unit 330 may output warning sounds or voice messages from speakers installed in or around the managed area.

[0029] <Operation of Security System 1> Next, the operation of the security system 1 according to this embodiment will be described with reference to Figures 2 and 3. Figure 2 is a flowchart showing an example of the processing flow in the sensor device 10 according to this embodiment.

[0030] First, the sensor 110 searches for radio waves emitted from information terminals within the managed area (step S101). For example, the sensor 110 searches for communication signals (e.g., "Probe request") transmitted on a predetermined frequency (e.g., the frequency on which it operates as an access point).

[0031] Next, the sensor 110 determines whether or not radio waves are present in the surrounding area (step S102). Specifically, the sensor 110 determines that radio waves are present in the surrounding area if it receives a communication signal, and determines that there are no radio waves present in the surrounding area if it does not receive a communication signal. If it determines that there are no radio waves present in the surrounding area (step S102: No), the sensor 110 returns to the process of step S101.

[0032] On the other hand, if it is determined that radio waves are present in the surrounding area (step S102: Yes), the processing unit 121 determines whether radio waves of a predetermined strength or higher are present for a predetermined period of time or longer. For example, the processing unit 121 determines whether the sensor 110 has been continuously receiving a communication signal with a radio wave strength of a predetermined value or higher for a predetermined period of time or longer. If radio waves of a predetermined strength or higher are not present for a predetermined period of time or longer (step S103: No), the processing unit 121 returns to the process in step S101.

[0033] Meanwhile, the processing unit 121 determines that an intruder has entered the managed area if radio waves of a predetermined intensity or higher are present for a predetermined period of time or longer (step S103: Yes). If the sensor 110 determines that an intruder is present, it stops searching for radio waves. The output unit 122 also generates intruder information, including the current date and time (i.e., the date and time of the intruder detection) and radio wave information related to the detected radio waves, if it determines that an intruder is present. The output unit 122 then transmits the generated intruder information to the warning device 30 and the server 20 to notify them of the presence of an intruder (step S104). After that, the process ends.

[0034] Figure 3 is a sequence diagram illustrating the operation of the security system 1 according to this embodiment. First, the sensor device 10 detects an intruder who has entered the managed area through the processing of steps S101 to S103 described above (step S201). Next, the sensor device 10 generates intruder information including the date and time of intrusion and radio wave information. Then, the sensor device 10 transmits the generated intruder information to the warning device 30 to notify it that an intruder is present (step S202). The sensor device 10 also transmits the generated intruder information to the server 20 to notify it that an intruder is present (step S203).

[0035] The warning device 30 receives intruder information from the sensor device 10. Based on the received intruder information, the warning device 30 issues a warning to the intruder (step S204). For example, the warning device 30 turns on warning lights or illuminations installed in the managed area. Alternatively, the warning device 30 outputs a warning sound or warning message from a speaker installed in the managed area. This allows for real-time warnings to be given to intruders. By providing real-time warnings, the risk of theft of crops, etc., can be reduced. It is also possible to notify people in the vicinity of the managed area that there is an intruder in the managed area.

[0036] Server 20 receives intruder information from sensor device 10. Based on the received intruder information, Server 20 notifies pre-configured recipients (e.g., administrators, police, local government, etc. within the managed area) of the presence of an intruder (step S205). For example, Server 20 sends an email notification to the email address of the administrator within the managed area informing them of the presence of an intruder. Alternatively, Server 20 may send an email notification to the email address of the police or local government informing them of the presence of an intruder. Alternatively, Server 20 may display, emit sound, or vibrate the information terminal of the recipient to notify them of the presence of an intruder. By notifying administrators, etc., in real time in this way, administrators, etc., can respond to the intruder immediately.

[0037] Next, the server 20 writes the received intruder information to the storage unit 230 (step S206). In other words, the storage unit 230 of the server 20 stores intruder information about the intruder. By storing intruder information, it becomes possible to analyze trends such as the timing, time of day, and frequency of thefts.

[0038] The processes described in steps S201 to S206 may be executed in a different order, and some processes may be omitted. For example, steps S202 and S203 may be executed in a different order.

[0039] As described above, the security system 1 according to this embodiment includes a sensor 110 that detects radio waves emitted from information terminals within the managed area, a processing unit 121 that determines whether or not there is an intruder in the managed area based on the radio waves detected by the sensor 110, and an output unit 122 that outputs intruder information to notify the presence of an intruder when it is determined that an intruder is present.

[0040] With this configuration, the security system 1 according to this embodiment detects intruders and notifies them in real time by detecting radio waves emitted from an information terminal used by the intruder. In this way, by detecting radio waves, it is possible to prevent false detection of animals that have entered the managed area as intruders. In other words, it is possible to differentiate between humans and animals. Therefore, it is possible to detect intruders into the managed area without falsely detecting animals. Furthermore, since devices such as access points that detect radio waves (communication signals) are less expensive than infrared cameras, the security system 1 can be constructed at a relatively low cost. Also, compared to image analysis processing of images captured by infrared cameras, intruders can be detected with simpler processing. In addition, since devices such as access points have a wider detection range compared to motion sensors such as PIR (Passive Infrared Ray) sensors, intruders can be detected with a relatively small number of sensors. Therefore, the cost of the security system 1 can be reduced. Furthermore, it is thought that intruders will be wary of surveillance cameras and motion sensors, and will try to enter the managed area by bypassing areas where there are no surveillance cameras or motion sensors. Even in such cases, security system 1 can detect the intruder if radio waves emitted from the intruder's information terminal are within its controlled range. In other words, because the intruder is detected using a detection method that the intruder did not anticipate, it becomes difficult for the intruder to take countermeasures in advance.

[0041] Furthermore, the security system 1 according to this embodiment determines whether or not there is an intruder in the managed area based on the intensity of the radio waves detected by the sensor 110.

[0042] With this configuration, the security system 1 according to this embodiment can determine the approximate distance from the sensor 110 to the information terminal based on radio wave strength, and filter out radio waves emitted from information terminals outside the managed area at the determined distance. This allows, for example, if there is a beacon device that periodically emits beacons near the managed area, the system can exclude the beacon device from detection based on the radio wave strength of the beacon. Furthermore, it reduces the risk of falsely identifying a person near the managed area (for example, a person outside the managed area but within the range where the sensor 110 can detect radio waves emitted from an information terminal) as an intruder.

[0043] Furthermore, the security system 1 according to this embodiment determines that there is an intruder within the managed area if the sensor 110 continues to detect radio waves for a preset period of time or longer.

[0044] With this configuration, the security system 1 according to this embodiment can detect as an intruder a person who remains within the managed area for a predetermined period of time or longer. For example, a person who breaks in to steal crops is likely to work within the managed area for a relatively long time. Therefore, by detecting as an intruder a person who remains within the managed area for a predetermined period of time or longer, intruders can be detected with greater accuracy. Furthermore, the risk of falsely identifying passersby who are just passing near the managed area as intruders can be reduced.

[0045] Furthermore, the security system 1 according to this embodiment transmits intruder information to an external information terminal. With this configuration, the security system 1 according to this embodiment can notify administrators within the managed area, or the police or local government, etc., of the presence of an intruder in real time. This enables administrators, etc., to respond to the intruder immediately.

[0046] Furthermore, the security system 1 according to this embodiment outputs a warning to the intruder via a warning device. With this configuration, the security system 1 according to this embodiment can provide a real-time warning to the intruder. This prevents the intruder from staying in the managed area for an extended period, thereby reducing the risk of theft of crops and other items.

[0047] Furthermore, although the above-described embodiment explained the case where there is one sensor 110, the security system 1 may include multiple sensors 110 installed at different locations within or around the managed area. The processing unit 121 may then determine the location of the intruder based on the intensity of the radio waves detected by each of the multiple sensors 110.

[0048] Figure 4 illustrates a method for identifying the location of an intruder using multiple sensors 110. For the sake of clarity, each of the sensors 110 will be distinguished using a sub-number such as "-1". In the illustrated example, the first sensor 110-1 is installed on the north side of the managed area AR, the second sensor 110-2 on the southwest side, and the third sensor 110-3 on the southeast side. Each sensor 110 searches for radio waves within the managed area AR. When an intruder enters the managed area AR, the first sensor 110-1, the second sensor 110-2, and the third sensor 110-3 each detect radio waves emitted from the intruder's information terminal. The processing unit 121 identifies the intruder's location P based on the strength of the radio wave SG1 received by the first sensor 110-1, the strength of the radio wave SG2 received by the second sensor 110-2, and the strength of the radio wave SG3 received by the third sensor 110-3. The output unit 122 may also output intruder information, including the location P of the identified intruder.

[0049] Figure 5 is an illustrative diagram showing an example of a notification screen 400 that notifies the location of an intruder. The notification unit 221 of the server 20 may display the notification screen 400 shown in this figure on the information terminal to which the notification is received. The notification screen 400 illustrated in the figure includes a first display area 401 that displays the date and time of intrusion, a second display area 402 that displays a notification of the intruder, a third display area 403 that displays text such as "The intruder is near Sensor #1 on the north side." indicating the intruder's location, and a fourth display area 404 that displays the intruder's location on a map. In the illustrated example, the intruder's location is displayed by an arrow 405 in the fourth display area 404. This allows, for example, administrators of the managed area to be notified of the intruder's approximate location P. The notification unit 221 may also update the intruder's location displayed on the notification screen 400 in real time according to the intruder's movement. In this case, the notification unit 221 may also display the intruder's location history (movement path) on the map in real time. Administrators and other personnel can deal with intruders more quickly by knowing their location. Furthermore, the warning device 30 can provide a stronger warning to intruders, such as by shining a light towards their location.

[0050] Furthermore, in addition to the sensor 110, the security system 1 may also include a motion sensor that detects people within the managed area. The motion sensor may be a PIR sensor, a microwave sensor, a heat sensor that detects ambient heat, an illuminance sensor, an acoustic sensor, an infrared camera, etc. For example, if an intruder is using the light of a smartphone or the like to steal, the illuminance sensor can detect the light. The processing unit 121 may then determine whether there is an intruder within the managed area based on the radio waves detected by the sensor 110, only when the motion sensor detects a person. This reduces false positives and allows for more accurate detection of intruders.

[0051] Furthermore, theft of agricultural products often occurs at night. On the other hand, workers are working in farms and other areas during the day. Therefore, it is likely that information terminals used by workers are within the managed area during daytime hours. Thus, the output unit 122 may be configured to output intruder information only during pre-set time periods at night. Alternatively, the sensor 110 may be stopped from searching outside of the pre-set time periods. Also, for example, if there is a person who takes a walk near the managed area every day at a specific time (e.g., 5 a.m.), the security system 1 may exclude that time period from the time period during which intruder information is output (i.e., intruders are detected). For example, the security system 1 may refer to the intruder information stored in the server 20 to identify time periods with a high rate of false positives (e.g., detecting a non-intruder as an intruder), and automatically exclude the identified time periods from the time periods during which intruders are detected. Alternatively, the security system 1 may accept input from an administrator for setting time periods during which intruders are not detected. In other words, an administrator may be able to set time periods during which intruders are not detected or are detected.

[0052] Furthermore, the processing unit 121 may exclude a specific person (or specific information terminal) from being considered an intruder based on the ID information or device name set in the detected communication signal. The ID information is, for example, unique information that identifies an individual information terminal. For example, the ID information may be ID information included in advertisements or beacons. For example, the processing unit 121 may determine that a person is not an intruder if the received communication signal contains the ID information or device name of an information terminal used by a person who is legally allowed to enter and exit the managed area (for example, an administrator or worker) or a person who frequently travels around the managed area (for example, a resident in the neighborhood of the managed area). Alternatively, for example, if there is a beacon device that periodically transmits beacons around the managed area, the beacon may be excluded from detection based on the ID information or device name included in the beacon. For example, the security system 1 may refer to the intruder information stored by the server 20 and automatically identify ID information or device names that should not be considered intruders based on the ID information or device names included in the communication signal when a false detection occurred (for example, a non-intruder was detected as an intruder). Alternatively, the security system 1 may accept input from an administrator or other person to set ID information or device names that are not considered intruders. In other words, the administrator or other person may be able to set ID information or device names that are not considered intruders (for example, the administrator themselves or workers).

[0053] Furthermore, the notification unit 221 of the server 20 may change the notification destination and content based on the ID information and device name set in the detected communication signal. For example, the server 20 may pre-generate a blacklist, which lists the ID information and device information of past intruders, based on the intruder information it has accumulated. If the ID information and device name set in the detected communication signal are on the blacklist, the notification unit 221 may change the notification destination to the police or other authorities. This allows the police or other authorities to be notified if an intruder who has previously infiltrated the managed area infiltrates the managed area again.

[0054] In the embodiment described above, the control unit 120 of the sensor device 10 determines whether or not there is an intruder. However, the control unit 220 of the server 20 may also determine whether or not there is an intruder based on the detection result of the sensor 110.

[0055] Some or all of the functions of the security system 1 in the above-described embodiment may be implemented by a computer. In that case, the functions may be implemented by recording a program for implementing these functions on a computer-readable recording medium, loading the program recorded on this recording medium into a computer system, and executing it. Here, "computer system" includes hardware such as the OS and peripheral devices. Furthermore, "computer-readable recording medium" refers to portable media such as flexible disks, magneto-optical disks, ROMs, CD-ROMs, and storage devices such as hard disks built into a computer system. Moreover, "computer-readable recording medium" may also include those that dynamically hold programs for a short period of time, such as communication lines used when transmitting programs via networks such as the Internet or communication lines such as telephone lines, and those that hold programs for a certain period of time, such as volatile memory inside a computer system that acts as a server or client in such a case. Furthermore, the above-mentioned program may be for implementing some of the functions described above, or it may be a program that can implement the above-mentioned functions in combination with a program already recorded in the computer system, or it may be implemented using a programmable logic device such as an FPGA (Field Programmable Gate Array).

[0056] While embodiments of this invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments and includes designs and the like that do not depart from the spirit of this invention. [Explanation of Symbols]

[0057] 1. Security system 10 Sensor device 110 Sensor 120 Control Unit 121 Processing Unit 122 Output section 130 Communications Department 20 servers 210 Communications Department 220 Control Unit 221 Notification Department 230 Storage section 30 Warning device 310 Communications Department 320 Control Unit 330 Warning section

Claims

1. A sensor that detects radio waves emitted from information terminals within the managed area, A processing unit that determines whether or not there is an intruder in the controlled area based on the radio waves detected by the sensor, An output unit that, when it is determined that an intruder is present, outputs intruder information notifying that an intruder is present, A security system equipped with these features.

2. The processing unit determines whether or not there is an intruder in the managed area based on the intensity of the radio waves detected by the sensor. The security system according to claim 1.

3. The processing unit determines that there is an intruder in the managed area if the sensor continues to detect radio waves for a predetermined period of time or longer. The security system according to claim 1.

4. The system comprises multiple sensors installed at different locations from each other, The processing unit identifies the intruder's location based on the intensity of the radio waves detected by each of the multiple sensors. The output unit outputs the intruder information, including the location of the identified intruder. The security system according to claim 1.

5. The system further includes a motion sensor that detects people within the aforementioned management area. The processing unit determines whether or not there is an intruder in the managed area based on the radio waves detected by the motion sensor, only when the motion sensor detects a person. The security system according to claim 1.

6. The output unit transmits the intruder information to an external information terminal. The security system according to claim 1.

7. The output unit causes the warning device to output a warning to the intruder. The security system according to claim 1.

8. The output unit outputs the intruder information only during a predetermined time period. The security system according to claim 1.

9. The aforementioned sensor detects data communication signals as radio waves. The security system according to claim 1.

10. A security method in a security system, The sensor detects radio waves emitted from an information terminal within the managed area, The processing unit performs the step of determining whether or not there is an intruder in the managed area based on the radio waves detected by the sensor, The output unit, when it determines that an intruder is present, outputs intruder information notifying that an intruder is present; Crime prevention methods including those mentioned.

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