JP2016167672A - Method for controlling operation of portable terminal device with positioning device mounted therein, portable terminal device and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect the privacy of a user of a portable terminal device with a GPS receiver mounted therein.SOLUTION: A secret place 401 is registered. A circular boarder line 403 is set with the secret place as a center. Further, identifiers of hot spots 411a-415a of a wireless LAN device that can be detected near access routes 410a-410c to the secret place are registered. The hot spots are registered as pairs 411-415 of hot spots on the same access route. When a portable terminal device 100 enters the inside of the boarder line, the GPS receiver is stopped. When the wireless LAN device mounted in the portable terminal device first detects a hot spot 415b regarding e.g., a pair 410c of hot spots and next detects the hot spot 415a, the GPS receiver is operated.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a technique for protecting the positional privacy of a user who uses a mobile terminal device equipped with a location device such as a GPS receiver or a radio device.

  A mobile terminal device such as a smartphone or a tablet terminal generally includes a GPS (Global Positioning System) receiver and a wireless device. The portable terminal device is equipped with an application program (GPS client) that uses the longitude / latitude position information acquired by the GPS receiver. The GPS receiving device set to enable provides position information based on a request from the GPS client.

  A user may photograph an object whose position such as home or work can be specified without intention of disclosure. The camera module, which is a GPS client, can embed the latitude and longitude of the shooting location, the shooting time, and the like as image information (geotag) in the image data using EXIF (Exchangeable image file format). At this time, the camera module can also incorporate map information such as a place name, a facility name, or an address corresponding to longitude / latitude acquired using a service that provides map information into the geotag.

  Therefore, when such a photograph is posted on an SNS (Social Networking Service) website, the map information of the shooting location is known to a third party from the shooting time, the content of the posting, etc., although the user does not intend. There is. In addition, when the application program (SNS client) that uses the SNS service is a GPS client at the same time, when posting a message, the map information of the posting location may be simultaneously known to a third party. The third party can estimate the map information of the user's workplace or home by integrating the message and time.

  Patent Document 1 discloses an invention that prevents the location information of a stay location that a user wants to keep secret from being disclosed indefinitely. This document does not disclose the longitude / latitude information related to the user's movement history even when requested by the server when the user's movement trajectory with respect to the publicly registered point and the pre-registered secret point are close. It is described to do. Further, this document describes that longitude / latitude information corresponding to an input address is read from a map information database and registered as a secret point or a public point.

  Patent Document 2 discloses an invention that discloses location information while protecting privacy in a mobile communication terminal having a GPS receiver capability. In the same document, when a disclosure request for location information is received from a third party through an SNS server, a disclosure request is received when the mobile terminal device is location information included in a privacy area designated in advance by the user. It is described that instead of a map URL corresponding to position information, a URL registered in advance as information abstracting the privacy area is returned to the server.

JP 2010-34784 A JP 2012-178696 A

  The inventions of Patent Literature 1 and Patent Literature 2 can protect privacy by not disclosing a movement trajectory corresponding to position information registered in advance by a user to a specific service. Recent portable terminal devices are equipped with a number of GPS clients. Further, the user downloads a newly developed GPS client. And privacy will be exposed if the GPS client transmits the positional information acquired without the user's knowledge or if the user inadvertently distributes the positional information acquired by the GPS client. Under such circumstances, it is difficult to incorporate a mechanism for restricting the disclosure of location information to all GPS clients implemented at that time.

  The function (GPS function) in which the GPS receiver informs the GPS client of the longitude and latitude can be set to enable or disable for each GPS client. In order not to disclose the location information of the privacy secret place such as home, work place or hospital, the user disables the GPS function for each GPS client in a certain area (privacy area) centering on the secret place. It is possible to do.

  However, before moving to the privacy area, it is not realistic to open a setting screen to disable a large number of GPS clients or to enable it when leaving the privacy area. Furthermore, it is necessary to assume that some GPS clients secretly collect location information in a state that the user cannot confirm. For such a GPS client, privacy exposure cannot be effectively prevented even if the GPS function is disabled.

  In order not to provide longitude / latitude to any GPS client, it is conceivable that the user disables the GPS receiver in the privacy area. However, the user may forget the operation of setting to disable. Also, it is convenient for the user to be able to use the GPS function outside the privacy area. For example, there are many cases where it is desirable to leave map information of a shooting location in a photo taken at a travel destination.

  However, the user may forget to enable the GPS receiver and cannot take a picture again, so the user hesitates to disable it. In order to be able to stop the GPS receiving device in the privacy area, it is premised that a method for ensuring that the GPS receiving apparatus can be used outside the privacy area is introduced. It can be presumed that the GPS receiver has not been stopped so as to protect the privacy until this point has not been solved.

  Recognize users in the communication range of a specific wireless base station from identifiers of wireless LAN devices using WiFi (registered trademark) and wireless WAN devices using 4GLTE, and advertise nearby restaurants and accommodations Position-linked advertisements distributed via push communication are also being carried out. If the user responds to such an advertisement after returning home, the third party is informed of staying in the area by collating with the personal information on the credit card. Therefore, in a mobile terminal device equipped with a device that acquires position information, it is necessary to protect the position privacy in consideration of such circumstances.

  Therefore, an object of the present invention is to provide a method for protecting the privacy of a user of a mobile terminal device equipped with a location device capable of acquiring location information. A further object of the present invention is to provide a method for reducing power consumption while a portable terminal device equipped with a location device protects user privacy. Furthermore, the objective of this invention is providing the portable terminal device and computer program which implement | achieve such a method.

  The present invention provides a method for controlling the operation of a mobile terminal device equipped with a position device capable of acquiring position information. In one aspect, boundary position information for specifying a public area and a privacy area is registered. The mobile terminal device detects current position information in the public area. The mobile terminal device that has determined that it has moved to the privacy region based on the current location information and the location information on the boundary stops the location device. Therefore, in the privacy area, it is possible to prevent any location client from acquiring location information from the location device and to disclose the location privacy of the user.

  The mobile terminal device that detects the current position information in the privacy area and determines that it has moved to the public area based on the current position information and the boundary position information can operate the position device. Accordingly, since it is not necessary to perform an operation for operating the position device once stopped in the public area, privacy protection and convenience of the position device can be achieved at the same time.

  Stopping the location device can be performed by stopping the function of the controlled device providing location information to the operating system. By stopping providing location information to the operating system, it is possible to prevent exposure of privacy by all location clients operating under the operating system service, including location clients installed later. The position device can also be stopped by stopping the power supply of the GPS receiver. Stopping power can reduce battery consumption and protect privacy from location clients that are aggressive to the software.

  The position device can be a GPS device or a wireless device mounted on the mobile terminal device. At this time, the GPS receiving device or the wireless device can detect the current position information in the public area, and the wireless device can detect the current position information in the privacy area. Alternatively, the GPS receiver or wireless device can detect current position information while the GPS receiver is operating, and the wireless device can detect current position information while the GPS receiver is stopped. . The location information acquired by the GPS receiver is more accurate than the location information acquired by the wireless device. Therefore, in the privacy area, the GPS receiver is stopped and the wireless device is operated to reduce the risk of privacy exposure. The operation of the GPS receiver in the area can be ensured.

  When the wireless device acquires the current position information, the boundary position information can be used as identifiers of a plurality of wireless base stations existing in the vicinity of the secret location. Then, the wireless device recognizes the moving direction between the public area and the privacy area by determining the detection order when the identifier is detected from the radio wave oscillated by the wireless base station, and stops or operates the position device. Either of the controls can be done.

  In another aspect of the invention, a location manager that controls the location device is executed. Register boundary location information to identify public and privacy areas. A location manager causes the mobile terminal device to function to detect current location information while the location device is operating. The mobile terminal such that the location manager stops providing current location information to all location clients while the location device maintains providing current location information to the location manager based on the current location information and the boundary location information Make the device work.

  In the above configuration, since the location manager can acquire location information from the location device in the privacy area, the location device's operation is performed using the location information detected by the location device even if it moves in either direction between the privacy area and the public area. Can be stopped while providing current location information to all location clients.

  According to the present invention, it is possible to provide a method for protecting the privacy of a user of a mobile terminal device equipped with a position device capable of acquiring position information. Furthermore, according to the present invention, it is possible to provide a method in which a portable terminal device equipped with a position device reduces power consumption while protecting user privacy. Further, according to the present invention, a portable terminal device and a computer program that realize such a method can be provided.

It is a functional block diagram which shows an example of a hardware structure of a portable terminal device. It is a functional block diagram which shows an example of a structure of the software mounted in a portable terminal device. It is a figure which shows a mode when a portable terminal device operate | moves. It is a flowchart for demonstrating the operation | movement procedure of a portable terminal device.

[Definition]
The meanings and meanings of terms used in the present specification are as follows. The position information is information that can specify a spatial position where the mobile terminal device exists or currently exists, and includes longitude and latitude and map information. The longitude of the wireless base station from the radio wave transmission range, such as the MAC address and SSID (identifier) of the access point (hot spot) of the public wireless LAN detected by the wireless LAN device, or the cell ID detected by the wireless WAN device. Information that can specify latitude or map information also corresponds to position information.

  The location information includes information on location privacy that the owner of the mobile terminal device does not want to expose. The longitude / latitude information can be acquired from the map information by a user holding the GPS receiver moving in space or using a well-known service such as Google Map (Google is a registered trademark). The conversion from the map information to the longitude / latitude information may be performed by the mobile terminal device of the user who wants to keep the position information confidential, or may be performed by a third party who has received the map information.

  The secret location refers to a geographical space where the user does not want to disclose location information through the network. The privacy area refers to a geographical space for estimating a secret place defined in the vicinity of the secret place. The public area means a geographical space other than the privacy area. There may be a plurality of privacy areas in the public area.

  The location device refers to a device mounted on a mobile terminal device that can acquire and provide current location information. A GPS receiver, a wireless LAN device, and a wireless WAN device are examples of position devices. The controlled device refers to a device to be controlled in order to protect privacy among position devices. The stop of the controlled device means a state in which position information is not provided to any program higher than the device driver installed in the mobile terminal device.

  The controlled device can be stopped by stopping the operation at the hardware level and stopping the function at the device driver level. The stop of the controlled device at the hardware level depends on the function of the hardware, but the stop of the power supply corresponds to the most reliable stop at the hardware level. The function stop at the device driver level can be realized by configuring the device driver to stop outputting the position information to the upper software layer when a specific condition is received.

  Alternatively, stopping the function at the device driver level can be done by inserting a filter driver that controls the output of the location information by the device driver in the software layer immediately above the device driver. It can be realized by not providing it. The operation of the controlled device refers to a state in which position information can be provided to the operating system and at least one of the position clients.

  The location client refers to an application program that acquires location information from a location device and an application program that acquires and discloses location information. When the controlled device is operating, it can provide or stop providing location information for each location client. Stopping the provision of position information to a specific position client is referred to as stopping the function of the controlled device for the position client.

  Stopping the function of the controlled device for a specific location client involves the risk that other location clients will obtain and expose location information from the controlled device. The stop of the controlled device has higher certainty of preventing the exposure of the position information than the stop of the function for each position client, and can increase the sense of security of the user. A control device refers to a device that obtains and provides current position information to control the operation of a controlled device among position devices.

  The controlling device provides current location information for at least control of the controlled device in a privacy region where the controlled device does not provide current location information to the location client. The controlling device may or may not match the controlled device. Since the control device also provides current location information in the privacy domain, there is a possibility that location clients will receive and publish the location information. Therefore, the control device that operates in the privacy area is controlled so as not to provide the current location information to the location client, or at least the location information that is less accurate than the controlled device is less accurate than the controlled device. It is required to provide.

[Hardware configuration of portable terminal device]
FIG. 1 is a functional block diagram illustrating an example of a hardware configuration of a mobile terminal device 100 such as a smartphone, a tablet terminal, or a notebook personal computer. FIG. 1 is described in a simplified manner within a range necessary for explaining the present embodiment. In the mobile terminal device 100, a CPU 101, a system memory 103, and a storage device 105 are connected to an I / O chipset 110.

  Furthermore, a GPS receiver 107, a wireless LAN device 109, and a wireless WAN device 111 are connected as an example of the position device. In addition, other peripheral devices 113 such as displays, cameras, and audio devices are connected. Furthermore, a power source 115 that supplies power to each device is connected. The power source 115 includes a battery, a charger, a DC / DC converter, and the like.

[Software configuration of mobile terminal device]
FIG. 2 is a block diagram illustrating a configuration of an execution state of software stored in the storage device 105 of the mobile terminal device 100. FIG. 2 is described in a simplified manner within a range necessary for explaining the present embodiment. Device drivers 207, 209, and 211 control the operation and data transfer of the GPS receiver 107, the wireless LAN device 109, and the wireless WAN device 111, respectively. The filter drivers 307, 309, and 311 transfer data to the location clients 223 and 225 while maintaining the operations of the GPS receiver 107, the wireless LAN device 109, and the wireless WAN device 111 by rewriting variables by the location manager 221. Stop.

  The location manager 221 controls the location device for privacy protection. The location clients 223 and 225 acquire location information from the location device and distribute the location information to the network. The position client 223 is an example, and acquires position information from a position device or creates data including position information, such as a camera application program that embeds position information in shooting data.

  The location client 225 is an example and posts a photograph in which location information is embedded together with a message, like an SNS client. In another example, the location client 225 sends the current location information acquired from the location device when requested by the server or another user. The mobile terminal device 100 can download and add a new location client.

[Control of portable terminal device 100]
FIG. 3 is a diagram for explaining a situation when the mobile terminal device on which the controlled device is mounted moves between the public area and the privacy area. FIG. 4 is a flowchart showing the operation of the mobile terminal device 100 when the controlled device is the GPS receiving device 107 and the GPS receiving device 107 or the wireless LAN device 109 is used as the control device.

  FIG. 3 shows a boundary that defines a privacy area and a public area. As an example of the boundary, a circular boundary line 403 identified by longitude and latitude with the secret place 401 as the center is shown. The boundary line 403 is used when the GPS receiver 107 operates as a control device. The boundary line 403 need not be limited to a circle, and may form a two-dimensional space having an arbitrary shape that connects several positions with straight lines or curves. FIG. 3 shows three access routes 410a, 410b, 410c that a user may enter or leave the secret location 401. FIG.

  The access routes 410a to 410c correspond to routes that the user may enter or leave the concealed place 401, such as roads, railroad tracks, or waterways. The boundary may be a one-dimensional space composed of line segments 403a, 403b, and 403c that traverse the access routes 410a, 410b, and 410c.

  As another example of the boundary, the radio wave transmission range of hot spots 411a, 411b, 413a, 413b, 415a, and 415b of the wireless LAN device 109 existing in the vicinity of the access routes 410a to 410c is shown. The hot spots 411a to 415b are an example, and may be stations, gas stations, fast food stores, supermarkets, and the like that exist in the vicinity of the access routes 410a to 410c.

  A pair of hot sports 411a and 411b, a pair of hot spots 413a and 413b, and a pair of hot spots 415a and 415b that exist in the vicinity of the same access route are a pair of hot spots 411, 413, and 415, respectively. Configure. Hot spot pairs 411-415 delimit the privacy and public areas. Hot spot pairs 411, 413, and 415 are used when the wireless LAN device 109 operates as a control device.

  In block 501 of FIG. 4, the user executes the location manager 221 to identify the location information of the secret location 401 that is the user's home. As an example, the location information of the secret location can be the longitude and latitude obtained by pointing the home on the map of Google Map (Google is a registered trademark). The secret location may be an identifier of a specific hot spot. The user can specify a plurality of secret places.

  In block 503, the user executes the location manager 221 to register the location information indicating the boundary between the privacy area and the public area in the storage device 105 or a server on the network for the secret location 401 specified in the mobile terminal device 100. The position manager 221 uses a Google Map (Google is a registered trademark) as an example to calculate the position of the boundary with respect to the GPS receiver 107 as a control device. It can be held as a formula or data for the boundary line 403. The user can determine the radius in consideration of the privacy level and the convenience of using the location device.

  As another example, the position manager 221 stores boundary position information with respect to the GPS receiver 107 serving as a control device as a formula of a longitude and latitude of a specific position existing around the secret location 401 and a straight line connecting them. Can do. Further, the position manager 221 can also register the boundary position information with respect to the GPS receiver 107 as a control device as an expression of the longitude and latitude of the line segments 403a to 403c crossing the access routes 410a to 410c.

  As yet another example, the position manager 221 registers boundary position information for the wireless LAN device 109 as a control device as identifiers of hot spot pairs 411 to 415. The identifiers of the hot spots 411a to 415b are acquired by the user moving the access routes 410a to 410c while operating the wireless LAN device 109 as a control device or using a service provided by a third party. be able to. The location manager 221 registers the hot spot pairs 411 to 415 including data for distinguishing between hot spots that are close to the secret location 401 and hot spots that are far from the secret location 401.

  In block 505, the user executes the location manager 221 to start using the mobile terminal device 100. At this time, the wireless LAN device 109 is also operated. When the position manager 221 starts operating, the GPS receiving device 107 as a controlled device operates when the mobile terminal device 100 exists in the public area, and stops when it exists in the privacy area. In block 507, when the GPS receiver 107 is operating, the process proceeds to block 509, and when it is stopped, the process proceeds to block 513.

  Since the GPS receiver 107 and the wireless LAN device 109 are operating, the location manager 221 can use the wireless LAN device 109 and / or the GPS receiver 107 as a control device in a public area. In block 509, the location manager 221 periodically requests the current location information from the wireless LAN device 109 and / or the GPS receiving device 107. The wireless LAN device 109 returns all identifiers detected from the latest hot spot beacon at the time of the request to the position manager 221, and the GPS receiving device 107 returns the latest longitude and latitude to the position manager 221. To do.

  In block 511, the location manager 221 determines whether the mobile terminal device 100 has entered the privacy area. The location manager 221 determines the order in which the identifiers of the hot spot pairs 411, 413, and 415 are detected within a predetermined time. The order in which the identifiers of the hot spot pairs 411, 413, 415 are detected is determined because the hot spot identifier only provides geographical point information of the radio base station. This is because it is not possible to accurately determine whether or not it is moving from the public area to the privacy area even if it is detected.

  For example, when the user moves the access route 410c, the location manager 221 detects the identifier of the hot spot 415b within a predetermined time following the identifier of the hot spot 415a. It can be recognized that the user has moved from the public area to the privacy area. The location manager 221 further acquires a received signal strength indicator (RSSI: Received Signal Strength Indicator) from the wireless LAN device 109, and determines the RSSI change tendency of the hot spot pairs 411, 413, and 415. It can also be determined in which direction 100 has moved from the boundary. The position manager 221 can determine whether the mobile terminal device 100 exists inside or outside the boundary line 403 from the current longitude and latitude received from the GPS receiver 107.

  Recognizing that the mobile terminal device 100 has entered the privacy area, the location manager 221 stops the operation of the GPS receiver 107 in block 513. At this time, the position manager 221 can control the power source 115 to stop the power of the GPS receiver 107. By stopping the power supply, it is possible to protect privacy and reduce power consumption by not providing longitude and latitude to any location client. Alternatively, the manager 221 can stop the GPS receiver 107 by rewriting the variables of the filter driver 307 so that all the latitudes and longitudes output from the GPS receiver 107 are not passed to the OS 210.

  Depending on the setting of the filter driver 307, even if the GPS receiver 107 is operating as hardware, the position manager 221 and the position clients 223 and 225 that operate by receiving the OS 210 and its service may acquire the longitude and latitude. Can not. When stopping only for the position clients 223 and 225 that currently implement the function of the GPS receiver 107, the installed position client may be able to acquire the longitude and latitude. By stopping the GPS receiver 107 with the filter driver 307, the possibility of providing location information to the added location client can be reduced.

  In block 515, the location manager 221 determines whether the mobile terminal device 100 has moved from the privacy area to the public area. In the privacy area, since the GPS receiving apparatus 107 that is a controlled device stops operating, it cannot be used as a control device. The position manager 221 can use the wireless LAN device 109 as a control device because the position information provided by the wireless LAN device 109 is rougher than the GPS receiving device 107 and the position on the map is difficult to identify.

  Alternatively, the location manager 221 can set the filter driver 309 to provide the hot spot identifier only to the location manager 221 when using the wireless LAN device 109 as a control device in the privacy area. For example, when the location manager 221 detects the identifier of the hot spot 413a within a predetermined time following the identifier of the hot spot 413b when the user moves along the access route 410b, the mobile terminal device 100 is in a privacy state. It can be recognized that the user has moved from the area to the public area. When the position manager 221 determines that it has moved to the public area, the GPS receiver 107 is operated in block 517.

  Next, a method in which the mobile terminal device 100 uses the GPS receiver 107 as a control device in the privacy area will be described. In this case, only the procedure of blocks 513 to 517 in FIG. 4 can be made different. The location manager 221 sets the filter driver 307 to provide longitude and latitude only to the location manager 221 without stopping the operation of the GPS receiver 107 at block 513.

  As a result, all location clients operating on the OS 210 cannot acquire longitude and latitude from the GPS receiver 107. Since the position manager 221 can acquire the longitude and latitude from the GPS receiver 107 even in the privacy area, the GPS receiver 107 can be used as a control device in the privacy area. In the above procedure, the wireless WAN device 111 can be used as a control device instead of the wireless LAN device 109 or together with the wireless LAN device 109.

  Next, a case where the controlled device is the wireless LAN device 109 will be described. When the wireless LAN device 109 is a controlled device, in the public area, the GPS receiving device 107, the wireless LAN device 109, and / or the wireless WAN device 111 can be used as a control device. On the other hand, the control device in the privacy area includes the GPS receiver 107, the wireless LAN device 107, and the wireless WAN device 111 in which the filter drivers 307, 309, and 311 are set so as to provide the longitude and latitude only to the position manager 221. Or either. The same control can be performed when the wireless WAN device 111 is a controlled device.

  Although the present invention has been described with the specific embodiments shown in the drawings, the present invention is not limited to the embodiments shown in the drawings, and is known so far as long as the effects of the present invention are achieved. It goes without saying that any configuration can be adopted.

100 Mobile terminal device 401 Secret area 403, 403a to 403c Boundaries 410a to 410c between public area and privacy area Access route 411 to 415 Hot spot pair 411a to 415b Hot spot

Claims (18)

A method for controlling the operation of a mobile terminal device equipped with a position device capable of acquiring position information,
Registering boundary location information to identify public and privacy areas;
The mobile terminal device detecting current location information in the public area;
A step of stopping the position device by the mobile terminal device that has determined that the mobile terminal apparatus has moved to the privacy area based on the current position information and the position information of the boundary. Detecting current location information in the privacy region;
The mobile terminal device that has determined that the mobile device has moved to the public area based on the current position information and the position information of the boundary, operates the position device.   The method of claim 2, wherein the stopping includes stopping a function of the location device to provide location information to an operating system.   The method of claim 2, wherein the stopping includes stopping power to the location device.   The method according to claim 2, wherein the position device is a GPS device or a wireless device mounted on the mobile terminal device.   The method according to claim 5, wherein the GPS receiving device or the wireless device detects current position information in the public area, and the wireless device detects current position information in the privacy area.   The GPS receiver or the wireless device detects current position information while the GPS receiver is operating, and the wireless device detects current position information when the GPS receiver is stopped. The method of claim 5.   The step of registering includes the step of registering identifiers of a plurality of radio base stations existing in the vicinity of the concealed place, and the radio apparatus detects the order of detection of the identifiers detected from radio waves oscillated by the radio base station. The method of claim 7 for determining. A method for controlling the operation of a mobile terminal device that mounts a location device capable of acquiring location information and a location client that uses the location information,
Executing a location manager to control the location device;
Executing the location client;
Registering boundary location information to identify public and privacy areas;
The location manager causing the mobile terminal device to function to detect current location information while the location device is operating;
The location manager provides current location information to all the location clients while the location device maintains providing current location information to the location manager based on the current location information and the boundary location information. Allowing the mobile terminal device to function to stop.   The method according to claim 9, wherein the GPS receiver detects current position information in the privacy region. A portable terminal device equipped with a location device capable of acquiring location information and capable of executing a plurality of location clients using the location information,
A storage device that stores boundary position information for identifying a public area and a privacy area related to a secret place;
A control device capable of acquiring current position information;
A mobile unit having a control unit that stops providing the location information to the plurality of location clients when it is determined that the mobile terminal device has moved to the privacy area based on the current location information and the location information of the boundary Terminal device.   The portable terminal device according to claim 11, wherein the control unit stops outputting position information by the position device when determining that the control unit has moved to the privacy area.   The mobile terminal device according to claim 11, wherein the control unit stops the operation of the position device when determining that the control unit has moved to the privacy area.   The control unit controls the location device to stop providing current location information to the location client while maintaining providing current location information to the control unit when determining that the control unit has moved to the privacy area. The portable terminal device according to claim 11.   The portable terminal device according to claim 11, wherein the boundary position information is associated with an access route to the secret location.   The portable terminal device according to claim 11, wherein the position device is a GPS receiver, a wireless LAN device, and / or a wireless WAN device. In a mobile terminal device equipped with a location device that can acquire location information,
A function for registering boundary position information for identifying public areas and privacy areas,
A function of determining in the public area or the privacy area based on the boundary position information;
A function of operating the location device in the public area;
A computer program for realizing a function of stopping the position device in the privacy area. In a mobile terminal device in which a position device capable of acquiring position information and a plurality of position clients using the position information are mounted.
A function for registering boundary position information for identifying public areas and privacy areas,
A function of determining in the public area or the privacy area based on the boundary position information;
A function in which the location device provides current location information to the location client in the public area;
A function of enabling the location device to stop providing the current location information to all the location clients while maintaining the current location information for controlling the location device in the privacy area. Computer program.

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