JP5561207B2 - Position information reliability determination program and position information reliability determination device - Google Patents

Description

  This case relates to a position information reliability determination program and a position information reliability determination apparatus.

  In recent years, in mobile terminals such as mobile phones, contents (games and the like) using position information obtained from GPS (Global Positioning System) and the like have been developed and used by users.

  In such mobile terminal content, measures have been taken to prevent the user from performing position information spoofing operations. For example, conventionally, countermeasures using Web functions such as session management and redirection have been taken using restrictions on mobile phones (restrictions such as inability to view HTML sources).

JP 2005-80084 A

  On the other hand, in terminals such as smartphones and notebook PCs, a user can view information transmitted and received using a communication protocol such as http (HyperText Transfer Protocol). Therefore, the user can change the source such as HTML or Java (registered trademark) script. In addition, the user can rewrite position information (for example, GPS information) acquired by a smartphone or the like. For this reason, the same location information spoofing measures as those of the conventional mobile phone described above are insufficient.

  Patent Document 1 discloses a method for determining the correctness of position information in a system including a portable terminal and a server that transmits position information to a server. In this method, when the mobile terminal transmits position information to the server, an identifier generated from data received in advance from the server is attached to the position information. Then, the server determines the correctness of the position information by comparing the identifier created using the same data with the identifier attached to the position information. In the method of Patent Document 1, it is possible to determine whether or not the position information has been tampered with after the identifier is generated, but it is not possible to determine the rewritten position information before generating the identifier.

  The present case has been made in view of the above problems, and an object thereof is to provide a position information reliability determination program and a position information reliability determination apparatus that can accurately determine the reliability of position information of a mobile terminal. And

  The position information reliability determination program described in this specification is a position information reliability determination program that determines the reliability of the position information of a terminal capable of executing an application program or driver added or modified by an unspecified user. , Acquiring the terminal location information acquired by the terminal, acquiring the first device information that the terminal acquires directly from the surrounding first devices, and based on the location information of the terminal, The terminal obtains a range where the information about the first device can be obtained, obtains information about the second device existing within the range, and obtains information about the first device and information about the second device, This is a position information reliability determination program for causing a computer to execute processing for determining reliability of position information acquired by the terminal based on the difference.

  The position information reliability determination apparatus described in the present specification is a position information reliability determination apparatus that determines the reliability of position information of a terminal capable of executing an application program or driver added or modified by an unspecified user. A location information acquisition unit that acquires location information of the terminal acquired by the terminal, and first device information that acquires information of the first device that the terminal acquires directly from the surrounding first devices Based on the acquisition unit and the position information of the terminal, a second device that obtains a range in which the terminal can acquire the information on the first device and acquires information on the second device existing in the range Based on the difference between the information acquisition unit, the information on the first device acquired by the first device information acquisition unit, and the information on the second device acquired by the second device information acquisition unit , The location information obtained by the terminal A determination unit for determining a degree, the position information reliability determination device comprising a.

  The position information reliability determination program and the position information reliability determination apparatus described in the present specification have an effect that the reliability of the position information of the mobile terminal can be determined with high accuracy.

It is a figure showing roughly the composition of the information processing system concerning one embodiment. FIG. 2A is a hardware configuration diagram of the mobile terminal, and FIG. 2B is a hardware configuration diagram of the server. It is a functional block diagram of a mobile terminal and a server. 4A is a diagram illustrating transmission data, FIG. 4B is a diagram illustrating a reliability list for each time, and FIG. 4C is a diagram illustrating a position spoofing terminal list. FIG. 4D is a diagram showing a position reliability list. FIG. 5A is a schematic diagram illustrating an example of a detection terminal and a position-neighboring terminal, and FIG. 5B is a table summarizing each terminal of FIG. It is a flowchart which shows the process of a position reliability management part. It is a flowchart which shows the process of step S12 of FIG. FIGS. 8A to 8D are diagrams showing lists created in the processes of FIGS. 6 and 7.

  Hereinafter, an embodiment will be described in detail with reference to FIGS. FIG. 1 schematically shows a configuration of an information processing system 100 according to an embodiment. As illustrated in FIG. 1, the information processing system 100 includes a mobile terminal 10 as a terminal and a server 50 as a position information reliability determination device. A plurality of mobile terminals 10 exist in the information processing system 100, and the plurality of mobile terminals 10 and the server 50 are connected via a network 70 such as the Internet.

  The mobile terminal 10 is a terminal that can execute an application program or driver added or modified by an unspecified user, and specifically, is a smartphone or a notebook PC.

  The server 50 provides a content service such as a game to the mobile terminal 10 and has a function of managing the reliability of the location information of the mobile terminal 10.

  FIG. 2A shows a hardware configuration diagram of the mobile terminal 10, and FIG. 2B shows a hardware configuration diagram of the server 50. As shown in FIG. 2A, the mobile terminal 10 includes a CPU 90, a ROM 92, a RAM 94, a storage unit (HDD (Hard Disk Drive)) 96, an absolute position acquisition device 93, a near field communication device 95, a network interface 97, and the like. It has. Each component of the mobile terminal 10 is connected to a bus 98. In the mobile terminal 10, the function of each unit shown in FIG. 3 is realized by the CPU 90 executing a program stored in the ROM 92 or the HDD 96. The network interface 97 includes an interface such as a wireless LAN or 3G (third generation mobile network). The absolute position acquisition device 93 receives a signal from a GPS satellite and acquires the position (absolute position) of the mobile terminal 10. The short-range communication device 95 is assumed to be a Bluetooth (registered trademark) interface.

  As shown in FIG. 2B, the server 50 includes a CPU 190, a ROM 192, a RAM 194, a storage unit (HDD) 196, a network interface 197, a portable storage medium drive 199, and the like. Each component of the server 50 is connected to the bus 198. In the server 50, a program (position information reliability determination program or the like) stored in the ROM 192 or the HDD 196, or a program read by the portable storage medium drive 199 from the portable storage medium 191 (position information reliability determination program or the like). 3 is implemented by the CPU 190.

  FIG. 3 shows a functional block diagram of the mobile terminal 10 and the server 50. As illustrated in FIG. 3, the mobile terminal 10 functions as a surrounding information acquisition unit 12, a position information acquisition unit 18, a transmission data generation unit 16, a game execution unit 20, and a communication unit 14 by the CPU 90 executing a program. Demonstrate. The server 50 also functions as the service providing unit 32, the communication unit 34, and the position reliability management unit 36 by the CPU 190 executing the program. In FIG. 3, storage units 24 and 38 realized by the mobile terminal 10 and the HDD of the server 50 are also illustrated.

  Hereinafter, each function of the mobile terminal 10 will be described.

  The surrounding information acquisition unit 12 communicates with the surrounding mobile terminal 10 via the short-range communication device 95, and sequentially acquires terminal information (ID) from the surrounding mobile terminal 10. That is, the surrounding information acquisition unit 12 acquires information that cannot be acquired unless sensing is performed in a place where the mobile terminal 10 exists. When the short-range communication device 95 is a Bluetooth (registered trademark) interface, a unique ID (for example, MAC address) of a mobile terminal equipped with any Bluetooth (registered trademark) within a certain distance (within a detection range) is obtained by a scanning operation. Can be listed. Information (ID) of the mobile terminal acquired by the surrounding information acquisition unit 12 is stored in the storage unit 24 together with the acquisition date.

  The position information acquisition unit 18 acquires the absolute position (latitude, longitude, altitude) of the mobile terminal 10 acquired via the absolute position acquisition device 93. The absolute position acquired by the position information acquisition unit 18 is stored in the storage unit 24 together with the acquisition date.

  The transmission data generation unit 16 acquires data from the storage unit 24 and generates transmission data. The transmission data is data that summarizes information associated with the acquisition date and time. Specifically, as shown in FIG. 4A, the transmission data includes an acquisition date and time, a terminal position (absolute position (latitude, longitude, altitude)) at the acquisition date and time, and surrounding information (ambient information acquisition unit). 12 acquired by the mobile terminal). Note that the transmission data in FIG. 4A is generated for each mobile terminal 10. In addition, the transmission data generation unit 16 transmits the transmission data to the server 50 via the communication unit 14.

  The game execution unit 20 executes game content provided from the server 50 (service providing unit 32). For example, the game execution unit 20 executes a game using the absolute position information acquired by the position information acquisition unit 18 and communicates with the service providing unit 32 through the communication units 14 and 34 as appropriate. In this game, the absolute position information of the mobile terminal 10 has an important meaning. For example, when the position information matches the target position, the user (mobile terminal 10) has an actual position such that a high point or item is given to the user, or the country or territory on the game space can be taken. , Shall be involved in the progress of the game. For this reason, if the absolute position information is modified in a terminal that can execute an application program or driver added or modified by an unspecified user such as a smartphone, there is a possibility that fairness among users in the game cannot be secured. is there.

  The communication unit 14 exchanges information with the server 50 via the network interface (wireless LAN or 3G) in FIG. For example, transmission data generated by the transmission data generation unit 16 is transmitted to the server 50, and exchanges between the game execution unit 20 and the service providing unit 32 of the server 50 are mediated.

  Next, each function of the server 50 will be described.

  The service providing unit 32 distributes the game content to the game execution unit 20 of each mobile terminal 10 and processes according to the progress of the game in the game execution unit 20 (for example, giving points according to the position information) )I do.

  The communication unit 34 receives transmission data transmitted from the transmission data generation unit 16 of each mobile terminal 10 and stores the transmission data in the storage unit 38 or mediates exchange between the game execution unit 20 and the service providing unit 32. To do.

  The location reliability management unit 36 determines and manages the reliability of location information transmitted from each mobile terminal 10. Specifically, the location reliability management unit 36 includes a terminal location information acquisition unit 42 as a location information acquisition unit, a first terminal information acquisition unit 44 as a first device information acquisition unit, and a second device. It has the 2nd terminal information acquisition part 46 as an information acquisition part, and the position reliability determination part 48 as a determination part.

  The terminal position information acquisition unit 42 acquires transmission data of the mobile terminal stored in the storage unit 38. This transmission data (see FIG. 4A) includes the terminal position information as described above. The first terminal information acquisition unit 44 obtains the information (ID) of the position vicinity terminal acquired directly from the mobile terminals (referred to as “detection terminals”) around the mobile terminal 10 acquired by the surrounding information acquisition unit 12. Extract and obtain from transmission data. For example, in FIG. 5A, when the mobile terminal 10 is represented by “Z”, the mobile terminals a, b, c indicated by ◯ and the mobile terminals e, f indicated by Δ are “detection terminals”. It shall be.

  Based on the location information of the mobile terminal 10, the second terminal information acquisition unit 46 obtains a range (detection range) in which the mobile terminal 10 can acquire information on surrounding terminals, and the mobile terminals (“ Information of the “location neighboring terminal”). Information on the mobile terminal existing within the detection range can be obtained from the transmission data. In FIG. 5A, it is assumed that the range indicated by the broken-line circle is the detection range of the mobile terminal 10 indicated by “Z”. In this case, the terminals a, b, c, m, n, o, and p existing in the detection range (within the broken line circle) are the position vicinity terminals. In the present embodiment, the detection terminal (a, b, c, e, f) corresponds to the first device, and the position vicinity terminal (a, b, c, m, n, o, p) corresponds to the first device. It corresponds to the apparatus of 2.

  The position reliability determination unit 48 determines the reliability of the position information of the mobile terminal 10 based on the difference between the position neighboring terminal and the information of the detection terminal. In the case of FIG. 5 (a), the terminals that should originally be detection terminals are the position neighboring terminals a, b, c, m, n, o, and p, whereas m, n, o, and p are detection terminals. Not a terminal. In addition, e and f are detection terminals although they should not be detection terminals. The position reliability determination unit 48 determines the reliability of the position information of the mobile terminal 10 (the mobile terminal Z in FIG. 5A) based on such a contradiction between the position neighboring terminal and the detection terminal.

  The storage unit 38 stores transmission data transmitted from the mobile terminal 10 side, each reliability list shown in FIG. 4B, a position spoofing terminal list shown in FIG. 4C, and FIG. The position reliability list shown in (d) is stored.

  Each time reliability list in FIG. 4B is a list for recording the reliability when each mobile terminal acquires position information once. Each time reliability list stores the date and time, each time reliability, and a group (ID of the mobile terminal 10 belonging to a group that may collide with the terminal of interest). Each reliability list is created for each mobile terminal 10. The position spoofing possibility terminal list in FIG. 4C stores the date and time and the ID of a mobile terminal that may spoof the position. The position information reliability list in FIG. 4D stores the reliability of a certain mobile terminal in a certain period.

  Next, processing (position reliability determination processing) in the information processing system 100 configured as described above will be described with reference to other drawings as appropriate along the flowcharts of FIGS.

  6 and 7, in each mobile terminal 10 that is executing the game, the surrounding information acquisition unit 12 acquires the information of the detection terminal at regular intervals via the short-range communication device 95. Assume that the data is stored in the storage unit 24. In each mobile terminal 10, it is assumed that the position information acquisition unit 18 acquires the absolute position information of the mobile terminal 10 at regular intervals via the absolute position acquisition device 93 and stores it in the storage unit 24. . Then, the transmission data generation unit 16 generates transmission data as shown in FIG. 4A from the information stored in the storage unit 24, and transmits the generated transmission data to the server 50 at a predetermined timing. Suppose you are. The transmission data in FIG. 4A is generated for each mobile terminal, and each transmission data is assigned an identification number for identifying the mobile terminal.

  In the process of FIG. 6, first, in step S <b> 10, the terminal position information acquisition unit 42 waits until a predetermined time elapses. Then, when the predetermined time has elapsed, the process proceeds to step S12. That is, in FIG. 6, the processes of steps S12 to S16 are executed at predetermined time intervals.

  When the process proceeds to step S12, each time the reliability calculation process of each mobile terminal 10 is performed. Here, each time reliability means the reliability calculated when Steps S12 to S16 are performed once. In step S12, processing according to the flowchart of FIG. 7 is executed.

  In the process of FIG. 7, first, in step S20, the terminal position information acquisition unit 42 pays attention to one mobile terminal and acquires upload information of the mobile terminal. Here, it is assumed that the mobile terminal focused on in step S20 is the mobile terminal Z. The upload information means transmission data (FIG. 4A) stored in the storage unit 38 from each mobile terminal 10.

  Next, in step S <b> 21, the first terminal information acquisition unit 44 acquires detection terminal information from the upload information. In the case of FIG. 4A and FIG. 5A, the first terminal information acquisition unit 44 has the mobile terminal information (ID) “a, b, c, e, f ".

  Next, in step S22, the second terminal information acquisition unit 46 searches for a terminal (position vicinity terminal) located within the detection range at the same time. Here, as described above, the detection range means a communication range of the short-range communication device 95 as indicated by a broken line in FIG. Therefore, the second terminal information acquisition unit 46 specifies a communication range centered on the position of the mobile terminal Z of interest as a detection range, and positions the mobile terminals existing at the same time within the detection range. Identifies as a nearby terminal. In this case, the 2nd terminal information acquisition part 46 specifies a position vicinity terminal based on the transmission data (refer Fig.4 (a)) of each mobile terminal. In the case of FIG. 5A, the location neighboring terminals are a, b, c, m, n, o, and p.

  Next, in step S24, the position reliability determination unit 48 collates the detection terminal (a, b, c, e, f) with the position neighboring terminal (a, b, c, m, n, o, p). .

  Next, in step S26, the position reliability determination unit 48 determines whether there is a terminal that is a detection terminal but is not a position vicinity terminal. When judgment here is affirmed, it transfers to step S28. On the other hand, when judgment here is denied, it transfers to step S30. In the case of FIG. 5A, the mobile terminals e and f indicated by x in the broken-line circle correspond to this (see FIG. 5B (a table summarizing FIG. 5A)). The determination is affirmed and the process proceeds to step S28.

  When the process proceeds to step S28, the position reliability determination unit 48 registers the terminal (normal terminal) that is the detection terminal and the position vicinity terminal and the terminal that is the detection terminal but not the position vicinity terminal in the position spoofing possibility terminal list. To do. Since these cannot be registered as a detection terminal even though the position is far from the mobile terminal Z, any one of the normal terminal and the detection terminal but not the position vicinity terminal is registered as a position misrepresentation terminal. This is because it is considered. In this case, the date and the position misrepresentation terminal are input to the position misrepresentation possibility terminal list as shown in FIG. In the column of the position misrepresentation possibility terminal, a group (a, b, c) (see FIG. 5B) of terminals (normal terminals) that are detection terminals and position vicinity terminals, and detection terminals but positions Terminals e and f (see FIG. 5B) that are not neighboring terminals are registered.

  Next, in step S30, the position reliability determination unit 48 determines whether there is a terminal that is not a detection terminal but is a position vicinity terminal. If the determination is negative, the process proceeds to step S36. If the determination is positive, the process proceeds to step S32. In the case of FIGS. 5 (a) and 5 (b), the mobile terminals m, n, o, and p correspond to terminals that are not detection terminals but are location-neighboring terminals, so the determination in step S30 is affirmed and step The process proceeds to S32.

  When the process proceeds to step S32, the position reliability determination unit 48 acquires the number of terminals that are not detecting terminals but are position neighboring terminals. In the case of FIGS. 5A and 5B, the position reliability determination unit 48 acquires “4” (m, n, o, p) as the number of terminals.

Next, in step S34, the position reliability determination unit 48 calculates the reliability each time. Specifically, each time reliability h ′ is calculated based on the following equation (1). In addition, the initial value h of each time reliability shall be 1 (maximum value), for example.
h ′ = h−γ × (number of terminals that are not a detecting terminal but a position neighboring terminal / total number within a detection range) (1)

Here, γ is a constant and can be a value such as 1/3, for example. As an example, assuming that h = 1 and γ = 1/3, in the case of FIGS. 5A and 5B,
h ′ = 1− (1/3) × (4/7) = 17 / 21≈0.81
It becomes. The position reliability determination unit 48 registers each time reliability h ′ calculated as described above in each time reliability list shown in FIG. In addition, the position reliability determination unit 48 also registers terminals belonging to the group determined to be a normal terminal in each reliability list. Note that the value of γ can be appropriately set by, for example, an administrator of the information processing system 100.

  If the determination in step S30 is negative, the calculation process of the above equation (1) is not performed, and thus the reliability of each time is maintained at h (maximum value).

  If the determination in step S30 is negative and the process proceeds to step S36, or if the process proceeds to step S36 via step S34, the position reliability determination unit 48 determines whether or not all mobile terminals are focused. . When judgment here is denied, it returns to step S20. Then, after paying attention to a terminal that has not been focused yet and acquiring the upload information (S20), the processing after step S21 is executed. On the other hand, if the determination in step S36 is affirmative, the entire process in FIG. 7 is terminated, and the process proceeds to step S14 in FIG. In addition, in the stage which transfers to step S14, each time reliability list shown in FIG.8 (b) is produced (or updated) for every mobile terminal.

If it transfers to step S14 of FIG. 6, the position reliability determination part 48 will update each time reliability of the terminal of a position misrepresentation terminal list. Specifically, for each mobile terminal listed in the position spoofing possibility terminal list, each time reliability h ′ is corrected using the correction value α, and a new each time reliability h ″ is calculated.
h ″ = h′−α (2)

  For example, when α = 1/3 and the mobile terminal Z is described in the position spoofing possibility terminal list, each new reliability h ″ is h ″ = 0.81− (1/3). ≈0.48 (see FIG. 8C). On the other hand, when the mobile terminal Z is not described in the location spoofing terminal list, the reliability is maintained as h ′ each time. Note that the value of α can be set as appropriate by, for example, an administrator of the information processing system 100. However, γ and α are numbers greater than 0 and less than 1, and α + γ does not exceed 1.

Next, in step S <b> 16, the position reliability determination unit 48 calculates the average value of the reliability for each time in the period for which the reliability is to be calculated as the position information reliability H. Specifically, the position information reliability H is calculated based on the following equation (3).
H = (sum of reliability for each time period to calculate) / (number of reliability for each time period to calculate) (3)

  Note that the administrator or the like can appropriately set the period during which the reliability is desired to be calculated. For example, the administrator can set a period from the current time to a predetermined time before. If the reliability value for the period for which the reliability is desired to be calculated has not yet been calculated, the process of step S16 may not be performed. In this case, the processing in FIG. 6 may be repeated, and the processing in step S16 may be performed at the stage where the reliability values for the period for which the reliability is to be calculated are accumulated. When step S16 is performed, the position reliability determination unit 48 calculates the position information reliability H in the position information reliability list of FIG. 8D, and the period during which the mobile terminal ID and the position information reliability H are calculated. Register with.

  When the above processing is completed, the process returns to step S10. Then, steps S12 to S16 are repeated at predetermined time intervals.

  As described above, the position information reliability H of the mobile terminal registered in the position information reliability list in FIG. 8D can be referred to by the administrator of the information processing system 100 as appropriate. In this case, the administrator can use the position information reliability H as an index value of the position information misrepresentation terminal. The administrator can also check the number of appearances of the terminals registered in the group column of each reliability list (FIG. 8 (c)) for the terminals with low positional information reliability H. In this case, when the number of appearances of a particular terminal combination is particularly large, the administrator may determine those terminals as a terminal group with low reliability and a terminal group that misrepresents location information. it can.

  As described above in detail, according to the present embodiment, position information acquired by a mobile terminal capable of executing an application program or driver added or modified by an unspecified user, such as a smartphone, is acquired (S20) The terminal acquires the information of the detection terminal directly acquired from the surrounding detection terminals (S21), and obtains the range (detection range) in which the mobile terminal can acquire the information of the detection terminal based on the position information of the mobile terminal Then, the information of the position vicinity terminal existing in the detection range is acquired (S22), and the reliability of each time of the position information acquired by the mobile terminal is calculated based on the difference between the information of the detection terminal and the information of the position vicinity terminal. Determine (S24-S34). Thereby, even if the position information acquired by the mobile terminal is misrepresented, the detection terminal (the terminal from which the information was obtained by the short-range communication device 95) and the position vicinity terminal (terminal to be the detection terminal) Since a contradiction occurs between them, the reliability can be determined with high accuracy by determining the reliability of the position information (reliability each time) based on this contradiction. Therefore, since a terminal that misrepresents position information can be found based on the reliability of the position information, a warning or the like can be given to the terminal. In addition, by realizing such determination and management of reliability, it is possible to expect a deterrent effect on the user's location misrepresentation.

  Japanese Patent Laid-Open No. 2010-206702 proposes a method for preventing forgery of position information in a system including a mobile terminal that transmits position information, a radio base station, and a signature server. In this method, each radio base station needs a special function for creating signature source data with its own station identification information added, or the mobile terminal needs to exist in the radio base station. . On the other hand, in this embodiment, it is not necessary to provide a special function for each radio base station, and there is an advantage that the reliability of the position information can be calculated wherever the mobile terminal exists.

  In the present embodiment, when the reliability is calculated each time, the reliability of the position information is subtracted based on the number of terminals that are position neighboring terminals but are not detection terminals. Thus, based on the number of terminals (terminals m, n, o, and p in FIG. 5A) that should originally be able to communicate via the short-range communication device 95 but are not actually communicable, Reliable. Further, in the present embodiment, since the reliability is calculated based on the proportion of terminals that are not actually able to communicate among the terminals that should originally be able to communicate via the short-range communication device 95, Reliability can be obtained.

  In the present embodiment, when there is a terminal that is a detection terminal but is not a position vicinity terminal, the terminal that is a detection terminal but is not a position vicinity terminal, and a terminal that is a detection terminal and a position vicinity terminal are acquired. Subtract the reliability of location information. As a result, more appropriate reliability can be calculated.

  In the above embodiment, the absolute position acquisition device 93 obtains the absolute position from the communication result with the GPS satellite, but the present invention is not limited to this. The absolute position acquisition device 93 may obtain the absolute position from the intensity of the radio wave received from a certain radio wave transmitter (such as a wireless LAN access point).

  In the above embodiment, the case where the short-range communication device 95 is a Bluetooth (registered trademark) interface has been described. However, the present invention is not limited to this, and the short-range communication device 95 may be a wireless LAN interface. In this case, the surrounding information acquisition unit 12 of the mobile terminal acquires information on the surrounding wireless LAN access points using the wireless LAN interface. That is, in this case, peripheral wireless LAN access points correspond to the first and second devices. Further, as the short-range communication device 95, a Bluetooth (registered trademark) interface and a wireless LAN interface may be used in combination. In this case, each of the mobile terminal and the wireless LAN access point corresponds to the first and second devices.

  The above processing functions can be realized by a computer. In that case, a program describing the processing contents of the functions that the processing apparatus should have is provided. By executing the program on a computer, the above processing functions are realized on the computer. The program describing the processing contents can be recorded on a computer-readable recording medium.

  When the program is distributed, for example, it is sold in the form of a portable recording medium such as a DVD (Digital Versatile Disc) or a CD-ROM (Compact Disc Read Only Memory) on which the program is recorded. It is also possible to store the program in a storage device of a server computer and transfer the program from the server computer to another computer via a network.

  The computer that executes the program stores, for example, the program recorded on the portable recording medium or the program transferred from the server computer in its own storage device. Then, the computer reads the program from its own storage device and executes processing according to the program. The computer can also read the program directly from the portable recording medium and execute processing according to the program. Further, each time the program is transferred from the server computer, the computer can sequentially execute processing according to the received program.

  The above-described embodiment is an example of a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

In addition, the following additional notes are disclosed regarding the above description.
(Supplementary note 1) A position information reliability determination program for determining reliability of position information of a terminal capable of executing an application program or driver added or modified by an unspecified user, the position of the terminal acquired by the terminal Information is obtained, the terminal obtains information on the first device directly obtained from the surrounding first devices, and the terminal obtains information on the first device based on the location information of the terminal. Is obtained at the terminal based on the difference between the information on the first device and the information on the second device. A position information reliability determination program for causing a computer to execute processing for determining reliability of position information to be performed.
(Additional remark 2) In the process which determines the said reliability, the reliability of the positional information acquired by the said terminal is made to the said computer based on the number of the apparatuses which are the said 2nd apparatus but are not the said 1st apparatus. The position information reliability determination program according to appendix 1, wherein a process for lowering is executed.
(Additional remark 3) In the process which determines the said reliability, when the apparatus which is the said 1st apparatus but is not the said 2nd apparatus exists in the said computer, it is said 1st apparatus, but said 2nd A supplementary note 1 or 2, wherein a process of lowering reliability of position information acquired by a terminal that is a device that is not a device and a device that is the first device and the second device is executed. Described location information reliability determination program.
(Supplementary Note 4) A position information reliability determining apparatus for determining reliability of position information of a terminal capable of executing an application program or driver added or modified by an unspecified user, the position of the terminal acquired by the terminal A location information acquisition unit that acquires information, a first device information acquisition unit that acquires information of the first device that the terminal acquires directly from the surrounding first devices, and location information of the terminal A second device information acquisition unit that obtains a range in which the terminal can acquire information on the first device and acquires information on a second device existing in the range; and the first device. Based on the difference between the information on the first device acquired by the information acquisition unit and the information on the second device acquired by the second device information acquisition unit, the position information acquired by the terminal And a determination unit for determining reliability. Position information reliability determination device.
(Additional remark 5) The said determination part reduces the reliability of the positional information acquired by the said terminal based on the number of apparatuses which are the said 2nd apparatus but are not the said 1st apparatus. The position information reliability determination device described in 1.
(Supplementary Note 6) When there is a device that is the first device but not the second device, the determination unit is the first device but the second device, and the first device. The position information reliability determining apparatus according to appendix 4 or 5, wherein the reliability of the position information acquired by a terminal corresponding to the second apparatus is reduced.

10 Mobile terminal (terminal)
50 servers (position information reliability determination device)
42 Terminal location information acquisition unit (location information acquisition unit)
44 1st terminal information acquisition part (1st apparatus information acquisition part)
46 2nd terminal information acquisition part (2nd apparatus information acquisition part)
48 Position Reliability Determining Unit (Determining Unit)

Claims (4)

A position information reliability determination program that determines the reliability of the position information of a terminal that can execute an application program or driver added or modified by an unspecified user,
Acquire the location information of the terminal acquired by the terminal,
Obtaining information of the first device that the terminal obtains directly from surrounding first devices;
Based on the location information of the terminal, obtain a range in which the terminal can obtain the information of the first device, obtain information of the second device existing in the range,
Position information that causes a computer to execute processing for determining reliability of position information acquired by the terminal based on a difference between information on the first device and information on the second device Reliability determination program.   In the process of determining the reliability, the computer executes a process of reducing the reliability of the position information acquired by the terminal based on the number of devices that are the second device but not the first device. The position information reliability determination program according to claim 1, wherein:   In the process of determining the reliability, when there is a device that is the first device but not the second device in the computer, the device that is the first device but is not the second device, 3. The position according to claim 1, wherein a process of reducing reliability of position information acquired by a terminal corresponding to the first apparatus and the second apparatus is executed. Information reliability determination program. A position information reliability determination device that determines the reliability of position information of a terminal capable of executing an application program or driver added or modified by an unspecified user,
A location information acquisition unit that acquires location information of the terminal acquired by the terminal;
A first device information acquisition unit that acquires information of the first device that the terminal directly acquires from the surrounding first devices;
A second device information acquisition unit that obtains a range in which the terminal can acquire information on the first device based on the position information of the terminal, and acquires information on a second device that exists in the range; ,
Acquired by the terminal based on the difference between the information on the first device acquired by the first device information acquisition unit and the information on the second device acquired by the second device information acquisition unit. A position information reliability determination device comprising: a determination unit that determines the reliability of the position information to be processed.

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