JP2018064181A - Position notification device, position notification program, and position notification control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position notification device, a position notification program, and a position notification control method that can recognize the position of an opposite terminal without labor of a terminal operation.SOLUTION: A position notification device includes a detection unit, a first acquisition unit, a second acquisition unit, and a display control unit. The detection unit detects reception electric field strength of short-range wireless communication that connects terminals. The first acquisition unit acquires a movement locus of the position notification device. The second acquisition unit acquires a movement locus of an opposite terminal when detected reception electric field strength is less than a prescribed value. The display control unit finds an amount of relative movement from the position notification device as an origin on the basis of a branching point where the position notification device and the opposite terminal branch off from the movement locus of the position notification device and the movement locus of the opposite terminal, and displays positional relation of the opposite terminal to the position notification device as the origin.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a position notification device, a position notification program, and a position notification control method.

  In recent years, large indoor facilities such as shopping malls have been built in various places. These indoor facilities may go out as a parent and child, and while the parent is shopping, the child may move to a place where his / her eyes cannot reach and get lost. In order for the parent to know the position of the child, each terminal detects the moving direction and moving distance based on the direction of acceleration and geomagnetism, and one terminal receives the moving direction and moving distance from the other terminal, and the difference It has been proposed to display for seeking. In this case, when communication with one terminal is established, the other terminal continues to transmit the moving direction and moving distance to the one terminal at a predetermined period. That is, in order to display the positional relationship on one terminal, an operation for enabling the function for determining the positional relationship for each terminal is required, for example, at the entrance of an indoor facility.

JP 2008-017380 A

  However, since the operation for enabling the function for obtaining the positional relationship is required to be performed for each terminal, it is troublesome. For example, when going to an indoor facility with a parent and child, it is required to perform an operation for enabling a function for obtaining a positional relationship on a terminal of each parent and child. For this reason, it takes time and effort for the parent to know the position of the terminal held by the child.

  In one aspect, the present invention provides a position notification device, a position notification program, and a position notification control method capable of recognizing the position of a counterpart terminal without troublesome terminal operation.

  In one aspect, the position notification device includes a detection unit, a first acquisition unit, a second acquisition unit, and a display control unit. The detection unit detects the received electric field strength of short-range wireless communication connecting each terminal. A 1st acquisition part acquires the movement locus | trajectory of an own terminal. The second acquisition unit acquires the movement locus of the counterpart terminal when the detected received electric field strength becomes less than a predetermined value. The display control unit obtains a relative movement amount starting from the own terminal based on a branch point where the own terminal and the other terminal branch from the movement locus of the own terminal and the movement locus of the other terminal, The positional relationship of the partner terminal is displayed starting from the terminal itself.

  The position of the partner terminal can be recognized without taking time to operate the terminal.

FIG. 1 is a diagram illustrating an example of a hardware configuration of the terminal device according to the first embodiment. FIG. 2 is a diagram illustrating an example of mounting the acceleration sensor. FIG. 3 is a diagram illustrating an example of mounting the geomagnetic sensor. FIG. 4 is a block diagram illustrating an example of a functional configuration of the terminal device according to the first embodiment. FIG. 5 is a diagram illustrating an example of the own terminal movement locus storage unit. FIG. 6 is a diagram illustrating an example of the counterpart terminal movement locus storage unit. FIG. 7 is a diagram illustrating an example of a boundary of received electric field strength. FIG. 8 is a diagram illustrating an example of timing for notifying each other of movement trajectories. FIG. 9 is a diagram illustrating an example of the movement trajectory of each terminal. FIG. 10 is a diagram illustrating an example of the trace of the movement trajectory. FIG. 11 is a diagram illustrating an example of the terminal movement amount and the relative movement amount. FIG. 12 is a diagram illustrating an example of a positional relationship display screen. FIG. 13 is a diagram illustrating another example of the positional relationship display screen. FIG. 14 is a flowchart illustrating an example of the position notification process according to the first embodiment. FIG. 15 is a flowchart illustrating an example of the position notification process according to the first embodiment. FIG. 16 is a flowchart illustrating an example of the position notification process according to the first embodiment. FIG. 17 is a block diagram illustrating an example of a functional configuration of the terminal device according to the second embodiment. FIG. 18 is a diagram illustrating an example of timing for starting acquisition of a movement trajectory. FIG. 19 is a diagram illustrating another example of the timing for notifying each other of the movement trajectories. FIG. 20 is a diagram illustrating another example of the trace of the movement trajectory. FIG. 21 is a diagram illustrating another example of the terminal movement amount and the relative movement amount. FIG. 22 is a flowchart illustrating an example of the position notification process according to the second embodiment. FIG. 23 is a flowchart illustrating an example of the position notification process according to the second embodiment. FIG. 24 is a flowchart illustrating an example of the position notification process according to the second embodiment. FIG. 25 is a block diagram illustrating an example of a functional configuration of the terminal device according to the third embodiment. FIG. 26 is a diagram illustrating an example of an access point installed in a facility. FIG. 27 is a diagram illustrating an example of a positional relationship display screen associated with a facility map. FIG. 28 is a flowchart illustrating an example of the position notification process according to the third embodiment. FIG. 29 is a flowchart illustrating an example of position notification processing according to the third embodiment. FIG. 30 is a flowchart illustrating an example of the position notification process according to the third embodiment.

  Hereinafter, embodiments of a position notification device, a position notification program, and a position notification control method disclosed in the present application will be described in detail based on the drawings. The disclosed technology is not limited by the present embodiment. Further, the following embodiments may be appropriately combined within a consistent range.

  FIG. 1 is a diagram illustrating an example of a hardware configuration of the terminal device according to the first embodiment. A terminal device 100 illustrated in FIG. 1 is an information processing device possessed by, for example, a parent and a child who are users. The terminal device 100 can be a mobile communication terminal such as a smartphone. Note that the terminal device 100 is, for example, a terminal device 100 possessed by a parent as its own terminal and a terminal device 100 possessed by a child as a counterpart terminal. The terminal device 100 detects the received electric field strength of short-range wireless communication connecting each terminal. The terminal device 100 acquires the movement locus of the terminal itself. The terminal device 100 acquires the movement locus of the counterpart terminal when the detected received electric field strength is less than a predetermined value. The terminal device 100 obtains the relative movement amount starting from the own terminal based on the branch point where the own terminal and the other terminal branch from the movement locus of the own terminal and the other terminal, and the other party starts from the own terminal. Displays the positional relationship of the terminal. Thereby, the terminal device 100 can recognize the position of the counterpart terminal without taking the effort of the terminal operation. In the following description, when the terminal device 100 is described by distinguishing between the own terminal and the partner terminal, the terminal device 100 may be represented as the own terminal 100a and the partner terminal 100b, respectively. The terminal device 100 is an example of a position notification device.

  As illustrated in FIG. 1, the terminal device 100 includes a first radio unit 102, a first radio control unit 103, a second radio unit 104, a second radio control unit 105, a display unit 106, and an operation unit 107. A camera unit 108, an acceleration sensor unit 109, and a geomagnetic sensor unit 110. Further, the terminal device 100 includes a power supply unit 111, an acoustic unit 112, a speaker 113, a microphone 114, a storage unit 120, and a control unit 130. The first radio control unit 103, the second radio control unit 105 to the acoustic unit 112, the storage unit 120, and the control unit 130 are connected to each other via the bus 140.

  The first wireless unit 102 is realized by a communication module such as a wireless local area network (LAN) and Bluetooth (registered trademark) (hereinafter also referred to as BT). An antenna 101 a is connected to the first radio unit 102. The first wireless unit 102 is a communication interface that controls communication of information with the counterpart terminal 100 b and the access point under the control of the first wireless control unit 103.

  In the first radio control unit 103, for example, a program stored in an internal storage device is executed using a RAM (Random Access Memory) as a work area by a CPU (Central Processing Unit), an MPU (Micro Processing Unit), or the like. Is realized. The first radio control unit 103 may be realized by an integrated circuit such as an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA).

  For example, the first radio control unit 103 controls the first radio unit 102 in response to a communication request from the second radio control unit 105, the control unit 130, and the like via the bus 140, and communicates with the counterpart terminal 100b and the access point. Communicate between them. Further, the first radio control unit 103 acquires the received electric field strength of the BT radio wave received by the first radio unit 102 and outputs the acquired received electric field strength to the control unit 130 via the bus 140. Note that the first wireless control unit 103 may acquire the received electric field strength of the wireless LAN radio wave.

  The first radio control unit 103 receives the movement locus and the relative movement amount from the counterpart terminal 100b via the first radio unit 102. The first wireless control unit 103 outputs the received movement trajectory and relative movement amount to the control unit 130 via the bus 140. In addition, the movement locus and the relative movement amount of the terminal 100 a are input to the first wireless control unit 103 from the control unit 130 via the bus 140. The first radio control unit 103 transmits the input movement trajectory and relative movement amount of the own terminal 100 a to the counterpart terminal 100 b via the first radio unit 102. Note that, when the control unit 130 instructs the pairing connection by the BT with the counterpart terminal 100b, the first radio control unit 103 starts the BT pairing connection with the counterpart terminal 100b. Moreover, the 1st radio | wireless control part 103 monitors so that the pairing connection by BT may be reset, when the pairing connection by BT with the other party terminal 100b is cut | disconnected.

  The second radio unit 104 is realized by, for example, a third generation mobile communication system, a wide area radio communication module such as LTE (Long Term Evolution), and the like. The second wireless unit 104 is connected to the antenna 101b. The second wireless unit 104 is a communication interface that controls communication of information with various servers on the Internet (not shown), for example, via wide area wireless under the control of the second wireless control unit 105.

  The second wireless control unit 105 is realized, for example, by executing a program stored in an internal storage device using the RAM as a work area by a CPU, an MPU, or the like. The second radio control unit 105 may be realized by an integrated circuit such as an ASIC or FPGA, for example. The second radio control unit 105 controls the second radio unit 104 in response to a communication request from the first radio control unit 103, the control unit 130, etc. via the bus 140, for example, and various servers on the Internet (not shown), for example Communicate with the.

  The display unit 106 is a display device for displaying various information. The display unit 106 is realized by, for example, a liquid crystal display as a display device. The display unit 106 displays various screens such as a display screen input from the control unit 130 via the bus 140.

  The operation unit 107 is an input device that accepts various operations from the user of the terminal device 100. The operation unit 107 is realized by, for example, a touch panel as an input device. That is, the display device of the display unit 106 and the input device of the operation unit 107 are integrated. The operation unit 107 outputs an operation input by the user to the control unit 130 as operation information. The operation unit 107 may be realized by, for example, a keyboard or a mouse as an input device without being integrated with the display unit 106.

  The camera unit 108 captures an image. The camera unit 108 captures an image using, for example, a complementary metal oxide semiconductor (CMOS) image sensor or a charge coupled device (CCD) image sensor as an image sensor. The camera unit 108 photoelectrically converts light received by the image sensor and performs A / D (Analog / Digital) conversion to generate an image. The camera unit 108 outputs the generated image to the control unit 130. In other words, the camera unit 108 is a camera such as a smartphone. For example, the camera unit 108 may take an image of the surroundings of the counterpart terminal 100 b and transmit it to the terminal 100 a via the first radio control unit 103 when notifying each other of the movement trajectory.

  The acceleration sensor unit 109 is a device that detects acceleration. FIG. 2 is a diagram illustrating an example of mounting the acceleration sensor. As illustrated in FIG. 2, for example, the acceleration sensor unit 109 includes a triaxial acceleration sensor 109 a that measures accelerations in three axial directions that are orthogonal to each other in the X axis direction, the Y axis direction, and the Z axis direction. As an acceleration detection method, any method such as a semiconductor method, a mechanical method, or an optical method can be adopted. The acceleration sensor unit 109 outputs the measured acceleration data to the control unit 130.

  Returning to the description of FIG. 1, the geomagnetic sensor unit 110 is a device that detects geomagnetism. FIG. 3 is a diagram illustrating an example of mounting the geomagnetic sensor. As shown in FIG. 3, for example, the geomagnetic sensor unit 110 includes a triaxial geomagnetic sensor 110 a that measures geomagnetism in three axial directions, ie, an X ′ axis direction, a Y ′ axis direction, and a Z ′ axis direction orthogonal to each other. The geomagnetic sensor unit 110 outputs azimuth data based on the measured geomagnetism to the control unit 130. The geomagnetic sensor unit 110 may measure the azimuth using a gyro sensor.

  Returning to the description of FIG. 1, the power supply unit 111 supplies power to each unit of the terminal device 100. As the power supply unit 111, for example, a lithium ion secondary battery can be used. Moreover, the power supply part 111 will charge a lithium ion secondary battery, if connected to an external power supply.

  A speaker 113 and a microphone 114 are connected to the acoustic unit 112. The sound unit 112 executes input / output of sound and output of alarm sound in response to an instruction from the control unit 130.

  Next, functional configurations of the storage unit 120 and the control unit 130 will be described with reference to FIG. FIG. 4 is a block diagram illustrating an example of a functional configuration of the terminal device according to the first embodiment. As illustrated in FIG. 4, the storage unit 120 is realized by, for example, a semiconductor memory device such as a RAM or a flash memory, or a storage device such as a hard disk or an optical disk. The storage unit 120 includes a local terminal movement locus storage unit 121 and a counterpart terminal movement locus storage unit 122. In addition, the storage unit 120 stores information used for processing in the control unit 130.

  The own terminal movement locus storage unit 121 stores the movement locus of the own terminal 100a. FIG. 5 is a diagram illustrating an example of the own terminal movement locus storage unit. As shown in FIG. 5, the own terminal movement locus storage unit 121 includes items such as “date and time”, “movement direction”, and “movement distance”. The own terminal movement locus storage unit 121 stores, for example, one record for each piece of movement locus data.

  “Date and time” is information indicating the date and time of the movement trajectory. Note that “date and time” is data every second when the own terminal 100a is continuously moving, assuming that the acquisition interval of the movement locus is set every second, for example. Further, the movement locus acquisition interval may be another set value. “Moving direction” is information indicating the moving direction of the terminal 100a. The “movement direction” is represented by an angle with 0 ° being north, for example. “Movement distance” is information indicating the movement distance of the terminal 100a. In the example of the first line in FIG. 5, assuming that the acquisition interval of the movement locus is 1 second, the terminal 100a will change from “2016/5/10 14:37:09” to “2016/5/10 14:37 : 10 ”indicates a movement of“ 0.82 ”m in the direction of“ 348 ° ”.

  The counterpart terminal movement locus storage unit 122 stores the movement locus notified from the counterpart terminal 100b. FIG. 6 is a diagram illustrating an example of the counterpart terminal movement locus storage unit. As illustrated in FIG. 6, the counterpart terminal movement locus storage unit 122 includes items such as “date and time”, “movement direction”, and “movement distance”. The counterpart terminal movement trajectory storage unit 122 has the same configuration as that of the own terminal movement trajectory storage unit 121, and a detailed description thereof will be omitted.

  The control unit 130 is realized, for example, by executing a program stored in an internal storage device using the RAM as a work area by a CPU, an MPU, or the like. The control unit 130 may be realized by an integrated circuit such as ASIC or FPGA, for example.

  The control unit 130 includes a detection unit 131, an acquisition unit 132, a notification acquisition unit 133, a calculation unit 134, and a display control unit 135, and realizes or executes information processing functions and operations described below. . Note that the internal configuration of the control unit 130 is not limited to the configuration illustrated in FIG. 4, and may be another configuration as long as the information processing described below is performed. In addition, when the power of the terminal 100a is turned on, the control unit 130 instructs the first wireless control unit 103 to perform pairing connection by BT with the counterpart terminal 100b set in advance.

  When receiving field strength of BT radio waves is input from first radio control section 103, detecting section 131 detects the BT receiving field strength of counterpart terminal 100b from the received receiving field strength. That is, the detection unit 131 detects the received electric field strength of wireless communication connecting each terminal. The detection unit 131 outputs the detected BT reception electric field strength to the acquisition unit 132 and the display control unit 135.

  When the pairing connection with the counterpart terminal 100b is completed, the acquisition unit 132 initializes the local terminal movement trajectory storage unit 121 and the counterpart terminal movement trajectory storage unit 122. That is, the acquisition unit 132 initializes data related to position detection between the own terminal 100a and the counterpart terminal 100b. When the data initialization is completed, the acquisition unit 132 starts acquiring the movement locus of the terminal 100a. That is, the acquisition unit 132 starts measurement by the acceleration sensor unit 109 and the geomagnetic sensor unit 110, and acquires acceleration data and azimuth data from the acceleration sensor unit 109 and the geomagnetic sensor unit 110. The acquisition unit 132 is an example of a first acquisition unit.

  The acquisition unit 132 determines whether or not the acceleration data exceeds a predetermined value. The predetermined value can be set to 0.3 G, for example. The predetermined value may be another value. That is, the acquisition unit 132 determines that the user of the terminal 100a has started to move if any of the three axes of acceleration data exceeds a predetermined value. If the acquisition unit 132 determines that the acceleration data does not exceed the predetermined value, the acquisition unit 132 determines whether or not the acceleration data exceeds the predetermined value, assuming that the user of the terminal 100a is stationary.

  If the acquisition unit 132 determines that the acceleration data exceeds a predetermined value, the acquisition unit 132 calculates the movement direction and movement distance of the terminal 100a based on the acceleration data and the direction data. The acquisition unit 132 stores the calculated movement direction and movement distance of the terminal 100a together with the date and time as a movement locus in the own terminal movement locus storage unit 121. In addition, when the own terminal 100a moves after mutually notifying the movement locus, the acquisition unit 132 similarly stores the movement locus corresponding to the movement in the own terminal movement locus storage unit 121.

  When the acquisition unit 132 stores the movement locus in the own terminal movement locus storage unit 121, the acquisition unit 132 determines whether or not the BT reception electric field strength is less than the threshold value b. The threshold value b can be set to, for example, −68 dBm, and the distance between terminals is about several tens of meters. When determining that the BT received electric field strength is not less than the threshold value b, the acquiring unit 132 determines whether the BT received electric field strength is between the threshold value a and the threshold value b. Note that the threshold value a is a threshold value corresponding to a trigger for initializing data, and can be set to, for example, −46 dBm, and the distance between terminals is about 2 m. Further, the threshold value a and the threshold value b are not limited to the above values as long as a> b.

  If the acquisition unit 132 determines that the BT reception electric field strength is between the threshold value a and the threshold value b, the acquisition unit 132 returns to the determination of whether or not the acceleration data exceeds a predetermined value. If the acquisition unit 132 determines that the BT reception electric field strength is not between the threshold value a and the threshold value b, the acquisition unit 132 initializes data related to position detection between the terminal 100a and the partner terminal 100b. If the acquisition unit 132 determines that the BT received electric field strength is less than the threshold value b, the acquisition unit 132 outputs a notification instruction to the notification acquisition unit 133.

  When the notification instruction is input from the acquisition unit 132, the notification acquisition unit 133 reads the movement locus of the own terminal 100a from the own terminal movement locus storage unit 121. When the notification acquisition unit 133 reads the movement locus of the own terminal 100 a, the notification acquisition unit 133 transmits the movement locus of the own terminal 100 a to the partner terminal 100 b via the first wireless control unit 103 and notifies it. In addition, the notification acquisition unit 133 requests the counterpart terminal 100b to notify the movement locus. That is, the notification acquisition unit 133 is an example of a second acquisition unit that acquires the movement locus of the counterpart terminal 100b when the detected received electric field strength is less than a predetermined value. Note that the notification acquisition unit 133 notifies the counterpart terminal 100b by transmitting the movement locus of the terminal 100a to the counterpart terminal 100b by using the wireless LAN when the BT cannot communicate. In addition, when a notification instruction is input from the acquisition unit 132, the notification acquisition unit 133 outputs a ringing instruction to the sound unit 112 and rings an alarm sound for a certain period of time.

  Further, the notification acquisition unit 133 determines whether or not a movement trajectory has been received from the counterpart terminal 100b via the first radio control unit 103. When the notification acquisition unit 133 determines that the movement locus has not been received from the counterpart terminal 100b, the notification acquisition unit 133 determines whether or not the BT communication interruption has elapsed for a predetermined time. The predetermined time can be 10 seconds, for example, but may be another value. If the notification acquisition unit 133 determines that the interruption of the BT communication has not elapsed for a predetermined time, the notification acquisition unit 133 continues to wait for the movement track from the counterpart terminal 100b.

  When it is determined that the BT communication has been interrupted for a predetermined time, the notification acquisition unit 133 determines whether or not a movement locus has been received through a wireless LAN connection. If the notification acquisition unit 133 determines that the connection is not received by the wireless LAN and the movement locus is not received, the notification acquisition unit 133 determines whether or not a predetermined time has passed since the wireless LAN cannot be connected. The predetermined time can be 10 seconds, for example, but may be another value. If the notification acquisition unit 133 determines that the state in which the wireless LAN cannot be connected has not elapsed for a predetermined period of time, the notification acquisition unit 133 continues to wait for the movement track from the counterpart terminal 100b.

  If the notification acquisition unit 133 determines that the state in which the wireless LAN cannot be connected has elapsed for a predetermined time, the notification acquisition unit 133 initializes a timer for standby for reception and tries to receive the movement locus from the partner terminal 100b by the BT again. . When the notification acquisition unit 133 determines that the movement locus has been received from the counterpart terminal 100b by BT or wireless LAN, the notification acquisition unit 133 receives the received movement locus of the counterpart terminal 100b in the counterpart terminal movement locus storage unit 122. Remember. Further, the notification acquisition unit 133 outputs a calculation instruction to the calculation unit 134.

  Furthermore, when the own terminal 100a moves after notifying each other of the movement locus, the notification acquisition unit 133 transmits the movement locus corresponding to the movement to the counterpart terminal 100b to notify it. In addition, when there is a movement locus newly notified from the partner terminal 100b after the notification acquisition unit 133 notifies the movement locus to each other, the notification acquisition unit 133 displays the notified movement locus of the partner terminal 100b as the partner terminal movement locus storage unit. 122. The notification acquisition unit 133 outputs a calculation instruction to the calculation unit 134 when there is a movement trajectory corresponding to the movement of one or more of the terminal 100a and the partner terminal 100b.

  In addition, when the relative movement amount starting from the counterpart terminal 100 b is input from the calculation unit 134, the notification acquisition unit 133 sends the input relative movement amount to the counterpart terminal 100 b via the first radio control unit 103. Send and notify. That is, the notification acquisition unit 133 notifies the partner terminal 100b of the calculated relative movement amount starting from the partner terminal 100b.

  Here, the received electric field strength of the BT will be described with reference to FIG. FIG. 7 is a diagram illustrating an example of a boundary of received electric field strength. As shown in FIG. 7, the received electric field strength distribution 20 centered on the terminal 100a is represented by a boundary representing the threshold value of the received electric field strength and the minimum received electric field strength, and a region between the boundaries. The boundary 21 is a boundary whether or not the received electric field strength of the counterpart terminal 100b is equal to or greater than the threshold value a. The boundary 22 is a boundary indicating whether or not the received electric field strength of the counterpart terminal 100b is equal to or higher than the threshold value b. The boundary 23 is a boundary indicating whether or not the reception field strength of the counterpart terminal 100b is equal to or higher than the minimum reception field strength.

  The area 24 is an area inside the boundary 21, that is, an area where the received electric field strength of the counterpart terminal 100b is equal to or higher than the threshold value a. The region 25 is a region between the boundary 21 and the boundary 22, that is, a region where the received electric field strength of the counterpart terminal 100 b is less than the threshold value a and equal to or more than the threshold value b. The region 26 is a region between the boundary 22 and the boundary 23, that is, a region where the received electric field strength of the counterpart terminal 100 b is less than the threshold value b and equal to or greater than the minimum received electric field strength. Note that the minimum received electric field intensity can be set to, for example, -88 dBm. Further, the inter-terminal distance is further several tens of meters longer than the inter-terminal distance corresponding to the threshold value b. The minimum received electric field strength is not limited to the above value.

  The region 24 is a case where the own terminal 100a and the counterpart terminal 100b are very close to each other. In this case, the own terminal 100a monitors the received electric field strength of the BT and initializes data related to position detection between the own terminal 100a and the counterpart terminal 100b. The very close position is, for example, a case where the parent and child are holding hands.

  The area 25 is an area where the own terminal 100a and the counterpart terminal 100b are starting to leave. In the area 25, the own terminal 100a stores its own movement locus according to the movement of the user who owns the own terminal 100a.

  The area 26 is an area in which the own terminal 100a and the counterpart terminal 100b are starting to be far apart. In the area 26, when the partner terminal 100b exceeds the boundary 22, the own terminal 100a requests the partner terminal 100b to notify each other of the movement trajectory. That is, the own terminal 100a notifies the other terminal 100b of its own movement locus, and the other terminal 100b notifies the movement locus of the other party terminal 100b. Moreover, in the area | region 26, the own terminal 100a sounds an alarm sound, and notifies the user (parent) of the own terminal 100a that the user (child) of the other party terminal 100b is largely separated. When the partner terminal 100b cannot communicate with the BT beyond the boundary 23, the own terminal 100a switches to the wireless LAN and notifies the movement locus to each other.

  FIG. 8 is a diagram illustrating an example of timing for notifying each other of movement trajectories. The example of FIG. 8 is a state in which the terminal 100a and the partner terminal 100b have moved away from each other. The own terminal 100a and the partner terminal 100b mutually notify the movement trajectory at the timing when the partner terminal 100b goes out of the region 25 beyond the boundary 22. At this time, the movement trajectory of the own terminal 100a becomes the movement trajectory 31 from the branch point 33, which is the point where the own terminal 100a and the counterpart terminal 100b start to move in different directions from a very close position. . Further, the movement locus of the counterpart terminal 100b is a movement locus 32 from the branch point 33 to the current position.

  Returning to the description of FIG. 4, when the calculation unit 134 receives a calculation instruction from the notification acquisition unit 133, the calculation unit 134 moves the movement locus of the own terminal 100 a from the own terminal movement locus storage unit 121 and the counterpart terminal movement locus storage unit 122. And the movement trajectory of the counterpart terminal 100b are read.

  The calculation unit 134 traces the movement locus from the current position with respect to the movement locus of the terminal 100a and the movement locus of the counterpart terminal 100b, and extracts a branch point where each movement locus branches. That is, the calculation unit 134 compares the movement trajectory of the own terminal 100a with the movement trajectory of the counterpart terminal 100b, and extracts a branch point where each movement trajectory branches.

  FIG. 9 is a diagram illustrating an example of the movement trajectory of each terminal. In the example of FIG. 9, when comparing the movement trajectory 31 of the own terminal 100a and the movement trajectory 32 of the counterpart terminal 100b, they are moving in the same way, but are moving in a different direction from a certain point. . In this case, the calculation unit 134 extracts a certain point, that is, the branch point 33.

  FIG. 10 is a diagram illustrating an example of the trace of the movement trajectory. As shown in FIG. 10, the calculation unit 134 traces the movement locus 31a from the current position of the terminal 100a. Further, the calculation unit 134 traces the movement locus 32a from the current position of the counterpart terminal 100b. As a result of tracing the movement trajectories 31a and 32a, the calculation unit 134 branches a portion where the movement trajectories of the own terminal 100a and the counterpart terminal 100b are moving in substantially the same direction and a portion moving in different directions. Point 33 is extracted.

  FIG. 11 is a diagram illustrating an example of the terminal movement amount and the relative movement amount. As shown in FIG. 11, the calculation unit 134 calculates a terminal movement amount 31 b indicating the direction from the branch point 33 to the current position and the linear distance based on the current position of the terminal 100 a and the position of the branch point 33. calculate. Further, the calculation unit 134 calculates the terminal movement amount 32b indicating the direction from the branch point 33 to the current position and the linear distance based on the current position of the counterpart terminal 100b and the position of the branch point 33.

  Based on the calculated terminal movement amount 31b of the own terminal 100a and the terminal movement amount 32b of the counterpart terminal 100b, the calculation unit 134 calculates each of the own terminal 100a to the counterpart terminal 100b and the counterpart terminal 100b to the own terminal 100a. The relative movement amounts 34a and 34b are calculated. The relative movement amount 34a is information indicating the direction and distance of the partner terminal 100b viewed from the terminal 100a. The relative movement amount 34b is information indicating the direction and distance of the terminal 100a viewed from the partner terminal 100b.

  The calculation unit 134 outputs the calculated relative movement amount 34a from the own terminal 100a to the partner terminal 100b, that is, the relative movement amount starting from the own terminal 100a to the display control unit 135. Further, the calculation unit 134 outputs the calculated relative movement amount 34b from the partner terminal 100b to the terminal 100a, that is, the relative movement amount starting from the partner terminal 100b, to the notification acquisition unit 133.

  Returning to the description of FIG. 4, when the relative movement amount starting from the own terminal 100a is input from the calculation unit 134, the display control unit 135 starts from the own terminal 100a based on the input relative movement amount. A display screen showing the positional relationship of the counterpart terminal 100b is generated. The display control unit 135 causes the display unit 106 to display the generated display screen. That is, the display control unit 135 displays the positional relationship between the own terminal 100a and the partner terminal 100b based on the acquired movement locus of the own terminal 100a and the movement locus of the other terminal 100b. The display control unit 135 may be the display control unit 135 including the calculation unit 134 described above.

  Further, when the relative movement amount starting from the own terminal 100a calculated again from the calculation unit 134 is input, the display control unit 135 updates the display screen indicating the positional relationship based on the input relative movement amount. To do. The display control unit 135 causes the display unit 106 to display the updated display screen. That is, the display control unit 135 updates the positional relationship between the own terminal 100a and the counterpart terminal 100b in real time.

  Further, after the display control unit 135 displays the display screen on the display unit 106 and the BT reception electric field strength of the counterpart terminal 100b is input from the detection unit 131, the display control unit 135 determines whether or not the BT reception electric field strength is greater than or equal to the threshold value a. judge. If the display control unit 135 determines that the BT reception electric field strength is less than the threshold value a, the display control unit 135 continues to display the display screen on the display unit 106. If the display control unit 135 determines that the BT received electric field strength is greater than or equal to the threshold value a, the display control unit 135 initializes the display screen and returns to the standby state. That is, when the display control unit 135 determines that the own terminal 100a and the partner terminal 100b are close to each other and does not have to display the position of the partner terminal 100b, the display control unit 135 initializes the display screen and performs the BT received electric field. Return to strength monitoring.

  Here, a display screen is demonstrated using FIG. 12 and FIG. FIG. 12 is a diagram illustrating an example of a positional relationship display screen. The example of FIG. 12 is a display screen 40a displayed on the display unit 106a of the terminal 100a. The display screen 40a has an area 41a for displaying a radio wave reception state, a remaining battery level, and the like, and an area 42a for displaying the positional relationship between the terminal 100a and the partner terminal 100b. In the area 42a, for example, an icon 43a indicating the user of the own terminal 100a and an icon 44a indicating the user of the counterpart terminal 100b are displayed. In the area 42a, for example, information 45a relating to the positional relationship between the own terminal 100a and the partner terminal 100b and an icon 46a indicating the traveling direction of the own terminal 100a are displayed. In the example of FIG. 12, the user of the own terminal 100a knows that the user of the counterpart terminal 100b is located 20m diagonally forward 20m.

  FIG. 13 is a diagram illustrating another example of the positional relationship display screen. The example of FIG. 13 is a display screen 40b displayed on the display unit 106b of the counterpart terminal 100b. The display screen 40b has an area 41b for displaying a radio wave reception state, a remaining battery level, and the like, and an area 42b for displaying a positional relationship between the terminal 100a and the partner terminal 100b. In the area 42b, for example, an icon 43b indicating the user of the own terminal 100a and an icon 44b indicating the user of the counterpart terminal 100b are displayed. In the area 42b, for example, information 45b regarding the positional relationship between the partner terminal 100b and the terminal 100a and an icon 46b indicating the traveling direction of the partner terminal 100b are displayed. In the example of FIG. 13, the user of the counterpart terminal 100 b can see that the user of the terminal 100 a is at a position 20 m diagonally backward to the left. Since the example of FIG. 13 is the display screen 40b of the counterpart terminal 100b, the icon 43b indicates the “partner” viewed from the counterpart terminal 100b. Further, the icon 44b indicates “self” viewed from the counterpart terminal 100b.

  Next, the operation of the terminal device 100 according to the first embodiment will be described. 14 to 16 are flowcharts illustrating an example of the position notification process according to the first embodiment.

  When the power of the terminal 100a is turned on, the control unit 130 of the terminal 100a instructs the first wireless control unit 103 to perform pairing connection by BT with the partner terminal 100b. The first radio control unit 103, when instructed by the control unit 130 to perform pairing connection with the counterpart terminal 100b by BT, performs pairing connection with the counterpart terminal 100b through the BT (step S1). Further, when receiving electric field strength of the BT radio wave is input from the first radio control unit 103, the detecting unit 131 detects the BT receiving electric field strength of the counterpart terminal 100b from the input receiving electric field strength. The detection unit 131 outputs the detected BT reception electric field strength to the acquisition unit 132 and the display control unit 135.

  When the pairing connection with the counterpart terminal 100b is completed, the acquisition unit 132 initializes data relating to position detection between the terminal 100a and the counterpart terminal 100b (step S2). The acquisition unit 132 starts measurement by the acceleration sensor unit 109 and the geomagnetic sensor unit 110 (step S3). The acquisition unit 132 acquires acceleration data and azimuth data from the acceleration sensor unit 109 and the geomagnetic sensor unit 110.

  The acquisition unit 132 determines whether or not the acceleration data exceeds a predetermined value (step S4). If the acquisition unit 132 determines that the acceleration data does not exceed the predetermined value (No at Step S4), the acquisition unit 132 repeats the determination at Step S4. If the acquisition unit 132 determines that the acceleration data has exceeded a predetermined value (step S4: affirmative), the acquisition unit 132 calculates the movement direction and movement distance of the terminal 100a based on the acceleration data and the direction data. The acquiring unit 132 stores the calculated moving direction and moving distance of the own terminal 100a together with the date and time as a moving track in the own terminal moving track storage unit 121 (step S5).

  When the acquisition unit 132 stores the movement locus in the own terminal movement locus storage unit 121, the acquisition unit 132 determines whether or not the BT reception electric field strength is less than the threshold value b (Step S6). If the acquisition unit 132 determines that the BT reception electric field strength is not less than the threshold value b (No at Step S6), the acquisition unit 132 determines whether the BT reception electric field strength is between the threshold value a and the threshold value b (Step S6). S7). If the acquisition unit 132 determines that the BT reception electric field strength is between the threshold value a and the threshold value b (Yes at Step S7), the acquisition unit 132 returns to Step S4. If the acquisition unit 132 determines that the BT reception electric field strength is not between the threshold value a and the threshold value b (No at Step S7), the acquisition unit 132 returns to Step S2.

  If the acquisition unit 132 determines that the BT reception electric field strength is less than the threshold value b (step S6: Yes), the acquisition unit 132 outputs a notification instruction to the notification acquisition unit 133. When the notification instruction is input from the acquisition unit 132, the notification acquisition unit 133 reads the movement locus of the own terminal 100a from the own terminal movement locus storage unit 121. When the notification acquisition unit 133 reads the movement locus of the own terminal 100a, the notification acquisition unit 133 transmits the movement locus of the own terminal 100a to the partner terminal 100b via the first wireless control unit 103 and notifies the same (step S8). In addition, the notification acquisition unit 133 requests the counterpart terminal 100b to notify the movement locus. Furthermore, when a notification instruction is input from the acquisition unit 132, the notification acquisition unit 133 outputs a ringing instruction to the acoustic unit 112 and rings an alarm sound for a certain period of time (step S9).

  Further, the notification acquisition unit 133 determines whether or not a movement trajectory has been received from the counterpart terminal 100b (step S10). When the notification acquisition unit 133 determines that the movement locus has not been received from the counterpart terminal 100b (No at Step S10), the notification acquisition unit 133 determines whether or not the BT communication has been interrupted for a predetermined time (Step S11). . If the notification acquisition unit 133 determines that the predetermined time has not elapsed from the BT communication interruption (No at Step S11), the notification acquisition unit 133 returns to Step S10.

  If the notification acquisition unit 133 determines that the interruption of the BT communication has elapsed for a predetermined time (step S11: affirmative), the notification acquisition unit 133 determines whether or not the movement locus is received through the wireless LAN connection (step S12). . If the notification acquisition unit 133 determines that it has not been connected by the wireless LAN and has not received the movement locus (No at Step S12), the notification acquisition unit 133 determines whether or not a state in which the wireless LAN cannot be connected has passed for a predetermined time ( Step S13). If the notification acquisition unit 133 determines that the predetermined time has not passed since the wireless LAN cannot be connected (No at Step S13), the notification acquisition unit 133 returns to Step S12.

  If the notification acquisition unit 133 determines that a predetermined time has elapsed after being unable to connect to the wireless LAN (step S13: Yes), the notification acquisition unit 133 initializes a timer for standby for reception (step S14) and returns to step S10.

  When the notification acquisition unit 133 determines that the movement locus has been received from the counterpart terminal 100b (step S10: affirmative or step S12: affirmation), the received movement locus of the counterpart terminal 100b is displayed as the counterpart terminal movement locus storage unit. 122. Further, the notification acquisition unit 133 outputs a calculation instruction to the calculation unit 134.

  When a calculation instruction is input from the notification acquisition unit 133, the calculation unit 134 compares the movement trajectory of the terminal 100a with the movement trajectory of the counterpart terminal 100b, and extracts a branch point where each movement trajectory branches. (Step S15). The calculation unit 134 calculates each terminal movement amount based on the movement trajectory of the own terminal 100a and the counterpart terminal 100b from the time at the branch point to the current time (step S16).

  Based on the calculated terminal movement amount of the own terminal 100a and the terminal movement amount of the counterpart terminal 100b, the calculation unit 134 performs relative movements of the own terminal 100a to the counterpart terminal 100b and the counterpart terminal 100b to the own terminal 100a. The amount is calculated (step S17). The calculation unit 134 outputs the calculated relative movement amount from the counterpart terminal 100b to the own terminal 100a, that is, the relative movement amount starting from the counterpart terminal 100b, to the notification acquisition unit 133. Further, the calculation unit 134 outputs the calculated relative movement amount from the own terminal 100a to the counterpart terminal 100b, that is, the relative movement amount starting from the own terminal 100a to the display control unit 135.

  When the relative movement amount starting from the counterpart terminal 100b is input from the calculation unit 134, the notification acquisition unit 133 transmits the input relative movement amount to the counterpart terminal 100b for notification (step S18).

  Further, when the relative movement amount starting from the own terminal 100a is input from the calculation unit 134, the display control unit 135, based on the input relative movement amount, the positional relationship of the counterpart terminal 100b with the own terminal 100a as the starting point. A display screen showing is generated. The display control unit 135 displays the generated display screen on the display unit 106 (step S19).

  If there is a movement locus newly notified from the partner terminal 100b after the notification acquisition section 133 notifies the movement locus to each other, the notification acquisition section 133 stores the notified movement locus of the partner terminal 100b in the partner terminal movement locus storage section 122. Remember. Further, the notification acquisition unit 133 outputs a calculation instruction to the calculation unit 134. When there is a movement path of the partner terminal 100b newly notified, the calculation unit 134 calculates the relative movement amount starting from the terminal 100a again. The calculation unit 134 outputs the calculated relative movement amount starting from the terminal 100a to the display control unit 135.

  When the relative movement amount starting from the terminal 100a calculated again from the calculation unit 134 is input from the calculation unit 134, the display control unit 135 updates the display screen indicating the positional relationship based on the input relative movement amount ( Step S20). The display control unit 135 causes the display unit 106 to display the updated display screen.

  The acquisition unit 132 determines whether or not the acceleration data exceeds a predetermined value (step S21). If the acquisition unit 132 determines that the acceleration data does not exceed the predetermined value (No at Step S21), the acquisition unit 132 returns to Step S20. If the acquisition unit 132 determines that the acceleration data exceeds a predetermined value (step S21: Yes), the acquisition unit 132 calculates the moving direction and moving distance of the terminal 100a based on the acceleration data and the azimuth data. The acquiring unit 132 stores the calculated moving direction and moving distance of the own terminal 100a together with the date and time as a moving track in the own terminal moving track storage unit 121 (step S22).

  When there is a movement locus corresponding to the movement of the terminal 100a, the calculation unit 134 calculates the relative movement amount starting from the terminal 100a again. The calculation unit 134 outputs the calculated relative movement amount starting from the terminal 100a to the display control unit 135.

  When the relative movement amount starting from the terminal 100a calculated again from the calculation unit 134 is input from the calculation unit 134, the display control unit 135 updates the display screen indicating the positional relationship based on the input relative movement amount ( Step S23). The display control unit 135 causes the display unit 106 to display the updated display screen. In addition, the notification acquisition unit 133 transmits a movement locus corresponding to the movement of the terminal 100a to the partner terminal 100b to notify (step S24).

  After the display control unit 135 displays the display screen on the display unit 106 and the BT reception field strength of the counterpart terminal 100b is input from the detection unit 131, the display control unit 135 determines whether the BT reception field strength is equal to or greater than the threshold value a. (Step S25). If the display control unit 135 determines that the BT received electric field strength is less than the threshold value a (No at Step S25), the display control unit 135 returns to Step S20.

  If the display control unit 135 determines that the BT reception electric field strength is greater than or equal to the threshold value a (step S25: Yes), the display control unit 135 initializes the display screen (step S26) and returns to step S2. Thereby, the own terminal 100a can recognize the position of the other party terminal 100b, without taking the effort of terminal operation. Further, the terminal device 100 can notify the position of the other terminal device 100 with each other while achieving both power saving and real-time performance. Furthermore, the terminal device 100 can guide the user to the position of the partner terminal device 100. Further, the terminal device 100 can obtain a highly accurate positional relationship.

  Thus, the terminal device 100 detects the received electric field strength of short-range wireless communication connecting each terminal. Moreover, the terminal device 100 acquires the movement locus | trajectory of the own terminal 100a. Further, the terminal device 100 acquires the movement locus of the counterpart terminal 100b when the detected received electric field intensity becomes less than a predetermined value. Further, the terminal device 100 obtains a relative movement amount starting from the own terminal 100a based on a branch point where the own terminal 100a and the other terminal 100b branch from the movement locus of the own terminal 100a and the movement locus of the other terminal 100b. . Further, the terminal device 100 displays the positional relationship of the counterpart terminal 100b starting from the terminal 100a. As a result, the position of the counterpart terminal 100b can be recognized without taking time and effort for the terminal operation.

  In addition, the terminal device 100 obtains a relative movement amount starting from the counterpart terminal 100b based on the branch point. Further, the terminal device 100 notifies the partner terminal 100b of the obtained relative movement amount starting from the partner terminal 100b. As a result, the positional relationship between the terminal 100a and the partner terminal 100b can be quickly displayed on the partner terminal 100b.

  In addition, when the terminal device 100 moves after the other terminal 100b and the movement locus are mutually notified, the terminal device 100 notifies the other terminal 100b of the movement locus corresponding to the movement. Moreover, the terminal device 100 calculates | requires the relative moving amount | distance from the own terminal 100a again based on the movement locus | trajectory according to a movement. Further, the terminal device 100 updates and displays the positional relationship based on the relative movement amount starting from the terminal 100a that has been obtained again. As a result, even if the terminal 100a moves, the positional relationship between the terminal 100a and the partner terminal 100b can be updated and displayed.

  In addition, when there is a movement path of the partner terminal 100b newly notified, the terminal device 100 obtains the relative movement amount starting from the terminal 100a again. Further, the terminal device 100 updates and displays the positional relationship based on the relative movement amount starting from the terminal 100a that has been obtained again. As a result, even if the counterpart terminal 100b moves, the positional relationship between the own terminal 100a and the counterpart terminal 100b can be updated and displayed.

  Further, when the terminal device 100 cannot notify the other terminal 100b and the movement locus mutually using the short-range wireless communication, the terminal device 100 uses the wireless communication different from the near-field wireless communication to mutually communicate the movement locus with the other terminal 100b. Notice. As a result, even if the counterpart terminal 100b moves beyond the minimum received electric field strength of the BT, the position of the counterpart terminal 100b can be recognized without taking the effort of the terminal operation.

  In the first embodiment, the movement trajectory when the user moves is acquired regardless of the received electric field strength of the BT. However, the acquisition of the moving trajectory of the terminal 100a is started according to the detected received electric field strength of the BT. The embodiment in this case will be described as Example 2. FIG. 17 is a block diagram illustrating an example of a functional configuration of the terminal device according to the second embodiment. Note that the same components as those of the terminal device 100 according to the first embodiment are denoted by the same reference numerals, and the description of the overlapping configuration and operation is omitted.

  The control unit 230 of the terminal device 200 according to the second embodiment includes an acquisition unit 232 and a calculation unit 234 instead of the acquisition unit 132 and the calculation unit 134 as compared with the control unit 130 of the terminal device 100 according to the first embodiment. In the following description, when the terminal device 200 is described by distinguishing between the own terminal and the partner terminal, the terminal device 200 may be represented as the own terminal 200a and the partner terminal 200b, respectively.

  When the pairing connection with the counterpart terminal 200b is completed, the acquisition unit 232 initializes the local terminal movement trajectory storage unit 121 and the counterpart terminal movement trajectory storage unit 122. That is, the acquisition unit 232 initializes data related to position detection between the terminal 200a and the partner terminal 200b. When receiving the BT reception electric field strength of the counterpart terminal 200b from the detection unit 131, the acquisition unit 232 starts acquiring the movement locus of the own terminal 200a according to the BT reception electric field strength. That is, the acquisition unit 232 starts acquiring the movement trajectory of the own terminal 200a according to the detected BT reception electric field strength. The acquisition unit 232 is an example of a first acquisition unit.

  Specifically, the acquisition unit 232 determines whether or not the BT reception electric field strength of the counterpart terminal 200b is less than the threshold value a. If the acquisition unit 232 determines that the BT reception electric field strength is not less than the threshold value a, the acquisition unit 232 determines that the BT reception electric field strength is less than the threshold value a, assuming that the counterpart terminal 200b is located very close. Do. Note that the threshold value a of the second embodiment can be set to a value smaller than the threshold value a of the first embodiment, for example, −48 dBm, and the distance between terminals is about 5 m. In this case, the counterpart terminal 200b is located in the area 24 shown in FIG. 7, and the own terminal 200a only monitors the received electric field strength of the BT. That is, the own terminal 200a stops the operations of the acceleration sensor unit 109 and the geomagnetic sensor unit 110 to save power.

  If the acquisition unit 232 determines that the BT received electric field strength is less than the threshold value a, the acquisition unit 232 starts measurement by the acceleration sensor unit 109 and the geomagnetic sensor unit 110, and receives acceleration from the acceleration sensor unit 109 and the geomagnetic sensor unit 110. Get data and orientation data. In this case, the partner terminal 200b is located in the area 25 shown in FIG. At this time, when the partner terminal 200b exceeds the boundary 21, the own terminal 200a starts the operation of the acceleration sensor unit 109 and the geomagnetic sensor unit 110, and starts measuring acceleration data and azimuth data. That is, the own terminal 200a starts acquiring its own movement trajectory.

  The acquisition unit 232 determines whether or not the acceleration data exceeds a predetermined value. The predetermined value can be set to 0.3 G, for example. The predetermined value may be another value. That is, the acquisition unit 232 determines that the user of the terminal 200a has started to move if any of the three axes of acceleration data exceeds a predetermined value. If the acquisition unit 232 determines that the acceleration data does not exceed the predetermined value, the acquisition unit 232 determines whether or not the acceleration data exceeds the predetermined value, assuming that the user of the terminal 200a is stationary.

  If the acquisition unit 232 determines that the acceleration data exceeds a predetermined value, the acquisition unit 232 calculates the moving direction and moving distance of the terminal 200a based on the acceleration data and the azimuth data. The acquisition unit 232 stores the calculated moving direction and moving distance of the own terminal 200a together with the date and time as a moving locus in the own terminal movement locus storage unit 121. In addition, when the own terminal 200a moves after mutually notifying the movement locus, the acquiring unit 232 similarly stores the movement locus corresponding to the movement in the own terminal movement locus storage unit 121.

  When the acquisition unit 232 stores the movement trajectory in the own terminal movement trajectory storage unit 121, the acquisition unit 232 determines whether or not the BT reception electric field strength is less than the threshold value b. The threshold value b can be set to, for example, −68 dBm, and the distance between terminals is about several tens of meters. Further, the threshold value a and the threshold value b are not limited to the above values as long as a> b. If the acquisition unit 232 determines that the BT reception electric field strength is not less than the threshold value b, the acquisition unit 232 determines whether the BT reception electric field strength is between the threshold value a and the threshold value b. If the acquisition unit 232 determines that the BT reception electric field strength is between the threshold value a and the threshold value b, the acquisition unit 232 returns to the determination of whether or not the acceleration data exceeds a predetermined value. When the acquisition unit 232 determines that the BT reception electric field strength is not between the threshold value a and the threshold value b, the acquisition unit 232 initializes data related to position detection between the terminal 200a and the partner terminal 200b.

  The acquisition unit 232 outputs a notification instruction to the notification acquisition unit 133 when determining that the BT reception electric field strength is less than the threshold value b.

  Here, with reference to FIGS. 18 and 19, the timing for starting the acquisition of the movement trajectory and the timing for notifying each other of the movement trajectory will be described.

  FIG. 18 is a diagram illustrating an example of timing for starting acquisition of a movement trajectory. As shown in FIG. 18, the own terminal 200a starts to acquire the movement trajectory at the timing when the own terminal 200a and the partner terminal 200b move and the partner terminal 200b goes out of the region 24 beyond the boundary 21. To do. Similarly, the partner terminal 200b starts to acquire the movement locus at the timing when the partner terminal 200b goes out of the region 24 beyond the boundary 21.

  FIG. 19 is a diagram illustrating another example of the timing for notifying each other of the movement trajectories. The example of FIG. 19 is a state in which the terminal 200a and the partner terminal 200b are further moved from the state of FIG. The own terminal 200a and the partner terminal 200b mutually notify the movement locus at the timing when the partner terminal 200b goes out of the region 25 beyond the boundary 22. At this time, the movement locus of the own terminal 200a becomes a movement locus 52 from the position 51 of the own terminal 200a to the current position in the state of FIG. Further, the movement locus of the partner terminal 200b is a movement locus 54 from the position 53 of the partner terminal 200b to the current position in the state of FIG. The position 53 of the partner terminal 200b is on the boundary 21a with the position 51 as the center.

  Returning to the description of FIG. 17, when the calculation instruction is input from the notification acquisition unit 133, the calculation unit 234 starts the own terminal 200 a based on the movement locus of the own terminal 200 a and the movement locus of the counterpart terminal 200 b. The relative movement amount is calculated. That is, the calculation unit 234 calculates the relative movement amount starting from the terminal 200a based on the point where the acquisition of the movement locus of the terminal 200a is started. Further, the calculation unit 234 calculates a relative movement amount starting from the counterpart terminal 200b.

  Furthermore, when there is a movement locus corresponding to the movement of the own terminal 200a, the calculating unit 234 calculates the relative movement amount starting from the own terminal 200a again. In addition, the calculation unit 234 again calculates the relative movement amount starting from the own terminal 200a even when there is a movement locus of the partner terminal 200b newly notified. That is, when the own terminal 200a or the partner terminal 200b moves, the calculation unit 234 calculates the relative movement amount to reflect the movement.

  Specifically, when the calculation instruction is input from the notification acquisition unit 133, the calculation unit 234 receives the movement trajectory of the own terminal 200a and the other party from the own terminal movement trajectory storage unit 121 and the counterpart terminal movement trajectory storage unit 122, respectively. The movement locus of the terminal 200b is read.

  The calculation unit 234 traces the movement locus from the current position with respect to the movement locus of the own terminal 200a and the movement locus of the opponent terminal 200b, and specifies the start points of the movement locus of the own terminal 200a and the opponent terminal 200b. That is, the calculation unit 234 specifies the start points of the movement trajectories of the own terminal 200a and the counterpart terminal 200b using the first data of the own terminal movement trajectory storage unit 121 and the counterpart terminal movement trajectory storage unit 122. In other words, the calculation unit 234 specifies a position where the terminal 200a and the partner terminal 200b start to leave.

  FIG. 20 is a diagram illustrating another example of the trace of the movement trajectory. As illustrated in FIG. 20, the calculation unit 234 specifies the position 51 by tracing from the current position of the terminal 200a like a movement locus 52a. Further, the calculation unit 234 traces from the current position of the counterpart terminal 200b like the movement locus 54a and specifies the position 53. The calculation unit 234 refers to the counterpart terminal movement trajectory storage unit 122 and specifies that the counterpart terminal 200b is at any position on the boundary 22 shown in FIG. Next, the calculation unit 234 traces from the current position of the counterpart terminal 200b like the movement trace 54a, the current position of the counterpart terminal 200b is on the boundary 22, and the tip of the movement trace 54a is centered on the position 51. The position 53 that satisfies the condition on the boundary 21a is specified. It is assumed that the movement locus 54a does not pass inside the boundary 21a. That is, the calculation unit 234 specifies the specified position 51 and position 53 as the start points of the movement trajectories of the own terminal 200a and the counterpart terminal 200b, respectively. For example, the position 53 of the counterpart terminal 200b may be extended to the position 51 of the terminal 200a by extending the movement locus 54a by a distance previously associated with the received electric field strength of the boundary 21a.

  That is, in the present embodiment, the region 24a that is inside the boundary 21a corresponds to the branch point 33 in the first embodiment. That is, the present embodiment is a variation in which the branch point 33 of the first embodiment is set slightly wider. The region 24a includes the specified position 51 and position 53. Here, this example and Example 1 are compared. In the first embodiment, as shown in FIG. 10, the movement trajectory is traced from the own terminal 100a and the partner terminal 100b to the branch point 33, and the relative movement amount between the own terminal 100a and the partner terminal 100b is obtained based on the branch point 33. Thus, a highly accurate positional relationship can be obtained. On the other hand, as shown in FIG. 20, this embodiment uses a region 24a that is wider than the branch point 33 region. The effect of power saving can be expected by delaying.

  FIG. 21 is a diagram illustrating another example of the terminal movement amount and the relative movement amount. As illustrated in FIG. 21, the calculation unit 234 calculates a terminal movement amount 52b indicating a direction and a linear distance from the position 51 to the current position based on the current position of the terminal 200a and the specified position 51. . Further, the calculation unit 234 calculates a terminal movement amount 54b indicating a direction and a linear distance from the position 53 to the current position based on the current position of the counterpart terminal 200b and the specified position 53.

  Based on the calculated terminal movement amount 52b of the own terminal 200a and the terminal movement amount 54b of the counterpart terminal 200b, the calculation unit 234 calculates each of the own terminal 200a to the counterpart terminal 200b and the counterpart terminal 200b to the own terminal 200a. Relative movement amounts 55a and 55b are calculated. The relative movement amount 55a is information indicating the direction and distance of the partner terminal 200b viewed from the own terminal 200a. The relative movement amount 55b is information indicating the direction and distance of the own terminal 200a viewed from the counterpart terminal 200b.

  The calculation unit 234 outputs the calculated relative movement amount 55a from the own terminal 200a to the partner terminal 200b, that is, the relative movement amount starting from the own terminal 200a to the display control unit 135. The calculating unit 234 also outputs the calculated relative movement amount 55b from the partner terminal 200b to the terminal 200a, that is, the relative movement amount starting from the partner terminal 200b, to the notification acquisition unit 133.

  Next, the operation of the terminal device 200 according to the second embodiment will be described. 22 to 24 are flowcharts illustrating an example of the position notification process according to the second embodiment. In the following description, the processes in steps S1, S2, S4 to S14, and S17 to S26 are the same as those in the first embodiment, and thus the description thereof is omitted.

  The terminal device 200 executes the following process following the process of step S2. When receiving the BT reception field strength of the counterpart terminal 200b from the detection unit 131, the acquisition unit 232 determines whether or not the BT reception field strength of the counterpart terminal 200b is less than the threshold value a (step S51). If the acquisition unit 232 determines that the BT reception electric field strength is not less than the threshold value a (No at Step S51), the acquisition unit 232 repeats the determination at Step S51.

  If the acquisition unit 232 determines that the BT received electric field strength is less than the threshold value a (step S51: Yes), the acquisition unit 232 starts measurement by the acceleration sensor unit 109 and the geomagnetic sensor unit 110 (step S52). The acquisition unit 232 acquires acceleration data and azimuth data from the acceleration sensor unit 109 and the geomagnetic sensor unit 110, and proceeds to step S4.

  The terminal device 200 executes the following process following the process of step S10: affirmative or step S12: affirmation. When a calculation instruction is input from the notification acquisition unit 133, the calculation unit 234 calculates each terminal movement amount based on the movement locus of the own terminal 200a and the movement locus of the counterpart terminal 200b (step S53). Proceed to step S17. Thereby, the own terminal 200a can recognize the position of the other party terminal 200b, without taking the effort of terminal operation. Moreover, even if the position of either one of the own terminal 200a or the partner terminal 200b is fixed, the terminal device 200 can recognize each other's position without taking the effort of the terminal operation. Furthermore, the terminal device 200 can achieve further power saving by delaying the acquisition of the movement trajectory.

  Thus, the terminal device 200 starts acquiring the movement locus of the terminal 200a according to the detected received electric field strength. Further, the terminal device 200 obtains a relative movement amount starting from the terminal 200a based on the point where the acquisition of the movement locus of the terminal 200a is started. As a result, it is possible to recognize the position of the partner terminal 200b as viewed from the own terminal 200a without taking time for terminal operation.

  Further, the terminal device 200 obtains a relative movement amount starting from the counterpart terminal 200b based on the point where the acquisition of the movement trajectory of the counterpart terminal 200b is started. In addition, the terminal device 200 notifies the partner terminal 200b of the obtained relative movement amount starting from the partner terminal 200b. As a result, the positional relationship between the terminal 200a and the partner terminal 200b can be quickly displayed on the partner terminal 200b.

  In each of the above embodiments, the positional relationship between the terminal and the partner terminal is displayed on the display screen. However, the positional relationship between the terminal and the partner terminal may be displayed in association with the facility map. The embodiment will be described as Example 3. FIG. 25 is a block diagram illustrating an example of a functional configuration of the terminal device according to the third embodiment. The same components as those of the terminal device 100 of the first embodiment or the terminal device 200 of the second embodiment are denoted by the same reference numerals, and the description of the overlapping configuration and operation is omitted.

  The control unit 330 of the terminal device 300 according to the third embodiment replaces the acquisition unit 232 and the display control unit 135 with an acquisition unit 332 and a display control unit 335, as compared with the control unit 230 of the terminal device 200 according to the second embodiment. Have. In addition, the control unit 330 further includes a specifying unit 336 as compared with the control unit 230. In the following description, when the terminal device 300 is described by distinguishing between the own terminal and the partner terminal, the terminal device 300 may be represented as the own terminal 300a and the partner terminal 300b, respectively.

  First, an access point installed in a facility will be described with reference to FIG. FIG. 26 is a diagram illustrating an example of an access point installed in a facility. In the facility 70 shown in FIG. 26, access points AP1 to AP4 are installed at various locations in the facility 70. The access point AP1 is installed at the entrance E1 of the facility 70. The access point AP2 is installed at the entrance E2 of the facility 70. Further, the access points AP3 and AP4 are installed in a supermarket in the facility 70. The access points AP1 to AP4 are access points corresponding to a wireless LAN, for example.

  A user who visits the facility 70 enters the facility 70 from the entrance E1 or the entrance E2. In the example of FIG. 26, when a user having the own terminal 300a enters the facility 70 from the entrance E1, the user passes through the area 71 of the access point AP1. When its own terminal 300a passes through the area 71, it connects with the access point AP1, and acquires location information of the access point AP1 and a map of the facility 70. That is, when passing through the entrance E1, the own terminal 300a can specify that the current location is the entrance E1 based on the location information of the access point AP1. Further, when a user having the own terminal 300a enters the facility 70 from the entrance E2, the user passes through the area 72 of the access point AP2. The own terminal 300a can specify that the current position is the entrance E2, as in the case of the entrance E1. In the present embodiment, the positional relationship between the terminal 300a and the partner terminal 300b is displayed in association with the map by specifying the position of the terminal 300a on the map based on the position information of the access point.

  Returning to the description of FIG. 25, when the pairing connection with the counterpart terminal 300b is completed, the acquisition unit 332 initializes the local terminal movement trajectory storage unit 121 and the counterpart terminal movement trajectory storage unit 122. That is, the acquisition unit 332 initializes data related to position detection between the own terminal 300a and the counterpart terminal 300b. When the data initialization is completed, the acquisition unit 332 outputs preparation completion information to the identification unit 336.

  When the position of the own terminal 300a specified by the specifying unit 336 is input, the acquiring unit 332 starts acquiring the movement locus of the own terminal 300a. That is, the acquisition unit 332 starts measurement by the acceleration sensor unit 109 and the geomagnetic sensor unit 110, and acquires acceleration data and azimuth data from the acceleration sensor unit 109 and the geomagnetic sensor unit 110. In other words, when the specifying unit 336 acquires the access point position information, the acquiring unit 332 starts acquiring the movement trajectory of the terminal 300a.

  The acquisition unit 332 determines whether or not the acceleration data exceeds a predetermined value. If the acquisition unit 332 determines that the acceleration data does not exceed the predetermined value, the acquisition unit 332 continues to determine whether or not the acceleration data exceeds the predetermined value, assuming that the user of the terminal 300a is stationary. If the acquisition unit 332 determines that the acceleration data exceeds a predetermined value, the acquisition unit 332 calculates the moving direction and moving distance of the terminal 300a based on the acceleration data and the azimuth data. The acquisition unit 332 stores the calculated movement direction and movement distance of the own terminal 300a in the own terminal movement locus storage unit 121 as a movement locus together with the date and time.

  The acquisition unit 332 determines whether or not the BT reception electric field strength is less than the threshold value b when the movement locus is stored in the own terminal movement locus storage unit 121. If the acquisition unit 332 determines that the BT received electric field strength is not less than the threshold value b, the acquisition unit 332 returns to the determination of whether or not the acceleration data exceeds a predetermined value. The acquisition unit 332 outputs a notification instruction to the notification acquisition unit 133 when determining that the BT reception electric field strength is less than the threshold value b.

  The display control unit 335 receives the location of the terminal 300 a identified from the identifying unit 336, location information of the access point, and a facility map. When the relative movement amount starting from the own terminal 300a is input from the calculation unit 234, the display control unit 335 indicates the positional relationship of the counterpart terminal 300b starting from the own terminal 300a based on the input relative movement amount. Create an object. The display control unit 335 generates a display screen by associating the generated objects on the facility map based on the input position of the terminal 300a, the position information of the access point, and the relative movement amount. The display control unit 335 causes the display unit 106 to display the generated display screen.

  In addition, when the relative movement amount starting from the own terminal 300a calculated again from the calculation unit 234 is input from the calculation unit 234, the display control unit 335 displays the positional relationship on the facility map based on the input relative movement amount. Update the display screen to be displayed in association. The display control unit 335 causes the display unit 106 to display the updated display screen.

  Furthermore, after the display control unit 335 displays the display screen on the display unit 106 and receives the BT reception electric field strength of the counterpart terminal 300b from the detection unit 131, the display control unit 335 determines whether the BT reception electric field strength is equal to or greater than the threshold value a. judge. If the display control unit 335 determines that the BT reception electric field strength is less than the threshold value a, the display control unit 335 continues to display the display screen on the display unit 106. If the display control unit 335 determines that the BT received electric field strength is greater than or equal to the threshold value a, the display control unit 335 initializes the display screen and returns to the state of monitoring the BT received electric field strength.

  When the preparation completion information is input from the acquisition unit 332, the specification unit 336 connects to an access point installed in the facility via the first wireless control unit 103. If the radio wave from the access point does not arrive, the specifying unit 336 waits until the radio wave arrives. When connected to the access point, the specifying unit 336 requests the location information of the access point and the facility map from the server device of the facility (not shown) connected to the access point.

  The identifying unit 336 determines whether the location information of the access point and the facility map have been acquired. If it is determined that the location information of the access point and the facility map have not been acquired, the specifying unit 336 continues to wait for acquisition of the location information of the access point and the facility map. If it is determined that the access point location information and the facility map have been acquired, the specifying unit 336 specifies the location of the terminal 300a on the acquired map based on the acquired access point location information. The identifying unit 336 outputs the identified position of the terminal 300a to the obtaining unit 332. Further, the specifying unit 336 outputs the specified position of the own terminal 300a, the position information of the access point, and the facility map to the display control unit 335.

  Here, a display screen including a facility map will be described with reference to FIG. FIG. 27 is a diagram illustrating an example of a positional relationship display screen associated with a facility map. The example of FIG. 27 is a display screen 73 displayed on the display unit 106 of the own terminal 300a. The display screen 73 includes an area 74 for displaying a radio wave reception state, a remaining battery level, and the like, and an area 75 for displaying the positional relationship between the terminal 300a and the partner terminal 300b in association with the facility map. In the area 75, for example, a facility map, an icon 76 indicating the user of the own terminal 300a, and an icon 77 indicating the user of the counterpart terminal 300b are displayed. In the area 75, for example, information 78 regarding the positional relationship between the own terminal 300a and the partner terminal 300b and an icon 79 indicating the traveling direction of the own terminal 300a are displayed. In the example of FIG. 27, it can be seen that the user of the terminal 300a is in a bag store and the user of the partner terminal 300b is in a toy store 20m diagonally forward to the right.

  Next, operation | movement of the terminal device 300 of Example 3 is demonstrated. 28 to 30 are flowcharts illustrating an example of the position notification process according to the third embodiment. In the following description, steps S1, S2, S4, S5, S8 to S14, S53, S17, S18, and S20 to S25 are the same as those in the first or second embodiment, and thus the description thereof is omitted.

  The terminal device 300 executes the following process following the process of step S2. When the data initialization is completed, the acquisition unit 332 outputs preparation completion information to the identification unit 336. When the preparation completion information is input from the acquisition unit 332, the specifying unit 336 connects to an access point installed in the facility. When connected to the access point, the specifying unit 336 requests the location information of the access point and the facility map from the server device of the facility (not shown) connected to the access point. The identifying unit 336 determines whether or not the location information of the access point and the facility map have been acquired (step S71). If it is determined that the location information of the access point and the facility map have not been acquired (No at Step S71), the specifying unit 336 repeats the determination at Step S71 to acquire the location information of the access point and the facility map. Wait.

  When determining that the location information of the access point and the map of the facility have been acquired (step S71: Yes), the specifying unit 336 determines the own terminal 300a on the acquired map based on the acquired location information of the access point. The position is specified (step S72). The identifying unit 336 outputs the identified position of the terminal 300a to the obtaining unit 332. Further, the specifying unit 336 outputs the specified position of the own terminal 300a, the position information of the access point, and the facility map to the display control unit 335.

  When the position of the own terminal 300a specified by the specifying unit 336 is input, the acquiring unit 332 starts measurement by the acceleration sensor unit 109 and the geomagnetic sensor unit 110 (step S73). The acquisition unit 332 acquires acceleration data and azimuth data from the acceleration sensor unit 109 and the geomagnetic sensor unit 110, and proceeds to step S4.

  The terminal device 300 performs the following process following the process of step S5. When the acquisition unit 332 stores the movement locus in the own terminal movement locus storage unit 121, the acquisition unit 332 determines whether or not the BT reception electric field strength is less than the threshold value b (step S74). If the acquisition unit 332 determines that the BT reception electric field strength is not less than the threshold value b (No at Step S74), the acquisition unit 332 returns to Step S4. If the acquisition unit 332 determines that the BT received electric field strength is less than the threshold value b (Yes at Step S74), the acquisition unit 332 outputs a notification instruction to the notification acquisition unit 133, and proceeds to Step S8.

  The terminal device 300 executes the following process following the process of step S18. When the relative movement amount starting from the own terminal 300a is input from the calculation unit 234, the display control unit 335 indicates the positional relationship of the counterpart terminal 300b starting from the own terminal 300a based on the input relative movement amount. Create an object. The display control unit 335 generates a display screen by associating the generated objects on the facility map based on the input position of the terminal 300a, the position information of the access point, and the relative movement amount. The display control unit 335 displays the generated display screen on the display unit 106 (step S75), and proceeds to step S20.

  The terminal device 300 performs the following process following the process of step S25. If the display control unit 335 determines that the BT reception electric field strength is greater than or equal to the threshold value a (step S25: Yes), the display control unit 335 initializes the display screen (step S76), and returns to step S4. Thereby, the own terminal 300a can recognize the position of the other party terminal 300b on a map, without taking the effort of terminal operation.

  As described above, the terminal device 300 acquires the location information of the access point installed in the facility and the map of the facility. Further, the terminal device 300 identifies the position of the terminal 300a on the map based on the acquired position information of the access point. In addition, when the terminal device 300 acquires the position information of the access point, the terminal device 300 starts acquiring the movement locus of the terminal 300a. Moreover, the terminal device 300 displays the positional relationship in association with the map. As a result, the position of the counterpart terminal 300b can be recognized on the map without taking time for terminal operation.

  In each of the above embodiments, Bluetooth (registered trademark) is used as the wireless communication for monitoring the received electric field strength, but the present invention is not limited to this. For example, other short-range wireless communication standards such as ZigBee (registered trademark) may be used. As Bluetooth (registered trademark), Bluetooth (registered trademark) Low Energy (BLE) may be used.

  In each of the above embodiments, the wireless LAN is used as the communication means other than Bluetooth (registered trademark), but the present invention is not limited to this. For example, various low power data communication systems may be used.

  In addition, each of the above embodiments can be applied to a place where a GPS (Global Positioning System) signal such as an indoor facility cannot be received, but is not limited thereto. For example, each of the above embodiments can be applied to a place where a building stands even outdoors and where the accuracy of positioning by GPS cannot be expected. In addition, you may apply said each Example in the place which can perform positioning by GPS.

  Furthermore, various processing functions performed by each device may be executed entirely or arbitrarily on a CPU (or a microcomputer such as an MPU or MCU (Micro Controller Unit)). In addition, various processing functions may be executed in whole or in any part on a program that is analyzed and executed by a CPU (or a microcomputer such as an MPU or MCU) or on hardware based on wired logic. Needless to say, it is good.

  Note that the terminal devices 100, 200, and 300 described in the above embodiments execute the same functions as the processing described in FIGS. 4, 17, 25, and the like by reading and executing the position notification program. Can do. For example, the terminal device 100 performs a process similar to that of the first embodiment by executing a process that performs the same process as the detection unit 131, the acquisition unit 132, the notification acquisition unit 133, the calculation unit 134, and the display control unit 135. Can be executed. Further, for example, the terminal device 200 executes a process for executing the same processing as that of the detection unit 131, the acquisition unit 232, the notification acquisition unit 133, the calculation unit 234, and the display control unit 135, and thus is the same as in the second embodiment. Can be executed. In addition, for example, the terminal device 300 performs the above-described process by executing a process that performs the same processing as the detection unit 131, the acquisition unit 332, the notification acquisition unit 133, the calculation unit 234, the display control unit 335, and the specification unit 336. The same processing as in Example 3 can be executed.

  These programs can be distributed via a network such as the Internet. Further, these programs can be executed by being recorded on a computer-readable recording medium such as a hard disk, a flexible disk (FD), a CD-ROM, an MO, and a DVD, and being read from the recording medium by the computer.

100, 200, 300 Terminal apparatus 100a, 200a, 300a Own terminal 100b, 200b, 300b Counterpart terminal 101a, 101b Antenna 102 First radio unit 103 First radio control unit 104 Second radio unit 105 Second radio control unit 106 Display unit 107 Operation Unit 108 Camera Unit 109 Acceleration Sensor Unit 110 Geomagnetic Sensor Unit 111 Power Supply Unit 112 Sound Unit 113 Speaker 114 Microphone 120 Storage Unit 121 Own Terminal Movement Trajectory Storage Unit 122 Counterpart Terminal Movement Trajectory Storage Unit 130, 230, 330 Control Unit 131 Detection Unit 132,232,332 Acquisition unit 133 Notification acquisition unit 134,234 Calculation unit 135,335 Display control unit 140 Bus 336 Identification unit

Claims (9)

A detection unit for detecting a received electric field strength of short-range wireless communication connecting each terminal;
A first acquisition unit that acquires a movement trajectory of the terminal;
A second acquisition unit that acquires a movement locus of the counterpart terminal when the detected received electric field strength is less than a predetermined value;
From the movement locus of the own terminal and the movement locus of the counterpart terminal, a relative movement amount starting from the own terminal based on a branch point where the own terminal and the counterpart terminal branch is obtained, and the origin terminal is set as the origin. A display control unit for displaying the positional relationship of the counterpart terminal;
A position notification device comprising: The first acquisition unit starts acquiring the movement trajectory of the terminal according to the detected received electric field strength,
The display control unit obtains a relative movement amount starting from the own terminal based on the point where the acquisition of the movement locus of the own terminal is started.
The position notification device according to claim 1. The display control unit obtains a relative movement amount starting from the partner terminal based on the branch point or a point where acquisition of the movement locus of the partner terminal is started,
The second acquisition unit notifies the partner terminal of the obtained relative movement amount starting from the partner terminal.
The position notification device according to claim 1, wherein the position notification device is provided. The second acquisition unit notifies the partner terminal of a movement locus corresponding to the movement when the terminal moves after the partner terminal and the movement locus are mutually notified.
The display control unit obtains the relative movement amount starting from the own terminal again based on the movement trajectory according to the movement, and determines the position based on the obtained relative movement amount starting from the own terminal again. Update and view relationships,
The position notification apparatus according to any one of claims 1 to 3. When there is a newly notified movement path of the counterpart terminal, the display control unit obtains the relative movement amount starting from the self terminal again, and the relative movement amount starting from the self terminal obtained again. Updating and displaying the positional relationship based on
The position notification device according to claim 4. The second acquisition unit uses the wireless communication different from the short-range wireless communication and the partner terminal and the mobile device when the short-range wireless communication cannot be used to mutually notify the counterpart terminal and the movement locus. Notify each other of the movement trajectory,
The position notification device according to any one of claims 1 to 5, wherein Further, the information processing apparatus includes a specifying unit that acquires position information of an access point installed in a facility and a map of the facility, and specifies a position of the terminal on the map based on the acquired position information of the access point. And
When the location information of the access point is acquired, the first acquisition unit starts acquiring the movement trajectory of the terminal itself,
The display control unit displays the positional relationship in association with the map.
The position notification device according to any one of claims 1 to 6. Detect the received field strength of short-range wireless communication connecting each terminal,
Get the movement path of your terminal,
When the detected received electric field strength is less than a predetermined value, the movement locus of the counterpart terminal is acquired,
From the movement locus of the own terminal and the movement locus of the counterpart terminal, a relative movement amount starting from the own terminal based on a branch point where the own terminal and the counterpart terminal branch is obtained, and the origin terminal is set as the origin. Displaying the positional relationship of the counterpart terminal;
A position notification program that causes a computer to execute processing. Detect the received field strength of short-range wireless communication connecting each terminal,
Get the movement path of your terminal,
When the detected received electric field strength is less than a predetermined value, the movement locus of the counterpart terminal is acquired,
From the movement locus of the own terminal and the movement locus of the counterpart terminal, a relative movement amount starting from the own terminal based on a branch point where the own terminal and the counterpart terminal branch is obtained, and the origin terminal is set as the origin. Displaying the positional relationship of the counterpart terminal;
A position notification control method, wherein a computer executes a process.

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