JP6652254B2 - Communication terminal and method - Google Patents

Description

  The present invention relates to a communication terminal and a method, and more particularly, to a communication terminal and a method capable of determining whether an access point is a public access point.

  When searching for an available public wireless LAN (Local Area Network) access point, a user has been searching for a public wireless LAN access point with reference to information such as a poster or a homepage of a communication carrier. At this time, when the access point automatic search function of the communication terminal is used, it is difficult to specify which SSID (Service Set Identifier) is the SSID for the public wireless LAN access point among the plurality of wireless LAN access points, There is a problem that it is difficult to easily select and connect a public wireless LAN access point. Further, if the communication terminal moves to a new area after connecting to the public wireless LAN access point, another public wireless LAN access point is searched again. If this fails, a 3G (3rd generation) communication fee is required. ) / LTE (Long Term Evolution).

  According to Patent Document 1, the location registration management unit of the wireless mobile phone compares the public base station ID in the captured wireless control information with the public base station ID stored in the public base station ID storage unit, and finds a match. If not, it is determined that the mobile station is located in a wireless zone of a public base station different from the public base station that performed the previous location registration, the ID of the new public base station is stored in the public base station ID storage unit, and the location registration is performed. It is disclosed to start.

  Patent Document 2 discloses that when a mobile phone can perform positioning by GPS, a positioning position obtained by GPS positioning is displayed as an output position on a screen, and the mobile phone can communicate at the time of GPS positioning. It discloses that a base station signal of a base station BS is measured to obtain a signal strength, data in which the measured signal strength is associated with a GPS positioning position is generated, and transmitted to a server system.

JP 2011-212256 A JP 2010-019774 A

  As described above, when there are a plurality of wireless LAN access points, it is difficult to specify which SSID is the SSID for the public wireless LAN access point, and a desired public wireless LAN access point is easily selected and connected. There was a problem that it was difficult.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a communication terminal and a method capable of determining whether an access point is a public access point.

  A communication terminal according to the present invention is an acquisition unit that acquires information about a communication device from the communication device, a storage unit that stores the communication device and the information about the communication device in association with each other, A control unit that determines the communication device as a public access point based on information about another communication device already stored in the storage unit.

  The method according to the present invention includes a step of obtaining information on a communication device from the communication device, a step of correlating the communication device and the information on the communication device with each other and storing the information in a storage unit, Determining the communication device as a public access point based on information about another communication device already stored in the storage unit.

  According to the present invention, it is possible to provide a communication terminal and a method capable of determining whether an access point is a public access point.

FIG. 2 is a block diagram illustrating a communication terminal according to Embodiment 1. FIG. 2 is a block diagram illustrating a communication terminal according to Embodiment 1. 5 is a flowchart illustrating an operation of the communication terminal according to the first embodiment. FIG. 3 is a diagram illustrating a configuration of an IEEE 802.11 frame. FIG. 9 is a block diagram illustrating a communication terminal according to a second embodiment. 9 is a flowchart illustrating an operation of the communication terminal according to the second embodiment. FIG. 2 is a diagram illustrating an access point and a plurality of communication terminals. 13 is a flowchart illustrating an operation of the communication terminal according to Embodiment 3.

[Embodiment 1]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram illustrating a communication terminal according to the first embodiment.

  As illustrated in FIG. 1, the communication terminal 10 includes an acquisition unit 12 that acquires information J20 about the access point 20 from the communication device 20 and a storage unit that stores the access point 20 and the information J20 about the access point 20 in association with each other. 13 and a control unit 14 for determining whether the access point 20 is a public access point. The control unit 14 determines the access point 20 as a public access point based on the information J20 on the access point 20 and the information J30 on the access point 30 already stored in the storage unit 13.

  FIG. 2 is a block diagram illustrating a communication terminal according to the first embodiment.

  As shown in FIG. 2, the communication terminal 10 includes a wireless unit 11 and a display unit 15. The wireless unit 11 communicates with the access point 20 and the access point 30, and transmits information received from the access point 20 and the access point 30 to the acquisition unit. The display unit 15 displays, for example, information J20 regarding the access point 20 and information J30 regarding the access point 30.

  The storage unit 13 has a first storage unit 13a and a second storage unit 13b. The first storage unit 13a is a storage area (spare storage area) where mapping preliminary information is stored, and stores information on access points that are not determined to be public access points. The second storage unit 13b is a storage area in which mapping information is stored (storage area for mapping), and stores information on an access point determined to be a public access point.

  The information J30 relating to the access point 30 may be stored in the first storage unit 13a in advance, or may be acquired from the access point 30 before acquiring the information J20 relating to the access point 20, and stored in the first storage unit 13a. It may be saved.

  Each of information J20 regarding access point 20 and information J30 regarding access point 30 includes communication information and belonging terminal information. Information J20 regarding access point 20 includes communication information J201 and belonging terminal information J203. Information J30 regarding access point 30 includes communication information J301 and belonging terminal information J303.

  The communication information J201 of the access point 20 is information for communicating with the access point 20, and the communication information J301 of the access point 30 is information for communicating with the access point 30. The belonging terminal information J203 of the access point 20 is the number of communication terminals belonging (connected) to the access point 20, and the belonging terminal information J303 of the access point 20 is the number of communication terminals belonging to the access point 30.

  The communication information J201 and the belonging terminal information J203 are stored in the storage unit in association with each other, and the communication information J301 and the belonging terminal information J303 are stored in the storage unit in association with each other.

  Each of the communication information J201 and the communication information J301 includes at least one of an SSID (Service Set Identifier) and a MAC (Media Access Control address).

  The control unit 14 includes an information combining unit 14a, a belonging number monitoring unit 14b, and a position information comparing unit 14c. The acquisition unit 12 acquires the position information J102 of the communication terminal 10. The information combining unit 14a uses the position information J102 of the communication terminal 10 as the position information J202 of the access point 20, and stores the communication information J201, the position information J202, and the belonging terminal information J203 of the access point 20 in the storage unit 13 in association with each other. I do.

  The belonging number monitoring unit 14b monitors belonging terminal information J203 regarding the number of communication terminals belonging to the access point 20. The position information comparing unit 14c compares the position information J202 of the access point 20 with the current position information J102 of the communication terminal 10.

Next, the operation of the communication terminal 10 will be described.
FIG. 3 is a flowchart illustrating an operation of the communication terminal according to Embodiment 1.

  Public access points are often provided by telecommunications carriers and companies, and the SSID is likely to be the same even in different areas. In addition, since a public access point is used by an unspecified number of users, there is a high possibility that the number of communication terminals belonging to the public access point is greater than that of a personal access point. Therefore, using these two trends, the same SSID is confirmed, and if the number of belonging communication terminals is equal to or greater than a predetermined value α, it is determined that the access point corresponding to this SSID is a public access point. I do. The outline of the flow will be described below.

  The communication terminal 10 receives the beacon transmitted from the access point 20, and determines whether the access point 20 that transmitted the beacon is a public wireless service access point based on information J20 related to the access point 20 included in the beacon. A determination is made, and only the information J20 regarding the access point determined to be the access point of the public wireless service is moved to the second storage unit 13b (the storage area for mapping) and stored. This will be described in detail below.

  As shown in FIG. 3, when the communication terminal 10 is within the communicable range of the access point 20 (step S101: Yes), the communication terminal 10 receives a beacon transmitted from the access point 20 by the wireless unit 11. Then, the acquisition unit 12 acquires the communication information J201 such as an SSID (Service Set Identifier) and a MAC (Media Access Control address) address included in the received beacon (step S102).

  If the communication terminal 10 does not exist within the communicable range of the access point 20 (step S101: No), the process proceeds to step S101, and it is confirmed again whether the communication terminal 10 is within the communicable range.

  Next, the communication terminal 10 checks whether or not the communication information J201 obtained from the received beacon has the same communication information in the storage unit 13 of the communication terminal 10 (step S103). That is, it is determined whether or not the same communication information as the communication information J201 exists in the first storage unit 13a storing the preliminary mapping information and the second storage unit 13b storing the mapping information.

  When there is the same communication information as the communication information J201 (step S103: Yes), the communication terminal 10 ends the flow.

  In step S103, when there is no communication information identical to the communication information J201 (step S103: No), the acquisition unit 12 of the communication terminal 10 uses the GPS (Global Positoning System) function to acquire the position information J102 of the communication terminal 10 itself. Is obtained (step S104). Then, the position information J102 of the communication terminal 10 itself is set as the position information J202 of the access point 20. Next, the acquisition unit 12 of the communication terminal 10 receives the wireless frame from the access point 20 and acquires the belonging terminal information J203 regarding the number of terminals belonging to the access point 20 (Step S105). The belonging number monitoring unit 14b monitors the belonging terminal information J203.

  Next, the information synthesizing unit 14a of the communication terminal 10 correlates the communication information J201, the position information J202, and the belonging terminal information J203 with each other, and stores them in the first storage unit 13a as information J20 regarding the access point 20 ( Step S106).

Here, a method of checking the number of communication terminals belonging to the access point will be described.
FIG. 4 is a diagram illustrating a configuration of an IEEE 802.11 frame.
As shown in FIG. 4, the IEEE 802.11 frame includes an IEEE 802.11 header, and the IEEE 802.11 header includes a source address and a destination address. Then, the IEEE 802.11 header can be referred to even by a third party communication terminal.

  The communication terminal receives the IEEE 802.11 frame transmitted from the access point, and checks a source address and a destination address included in the IEEE 802.11 header. The communication terminal can confirm the belonging terminal information belonging to the access point based on the information of the source address and the destination address. That is, the communication terminal can identify the communication terminal belonging to the access point based on the source address and the destination address, and can confirm the number of the belonging communication terminals.

  Subsequently, returning to FIG. 3, the operation of the communication terminal according to Embodiment 1 will be described. It is assumed that the information J30 regarding the access point 30 acquired from the access point 30 is already stored in the first storage unit 13a before the information J20 regarding the access point 20 is stored.

  Next, the communication terminal 10 compares the information J30 regarding the access point 30 already stored in the first storage unit 13a with the information J20 regarding the access point 20 newly stored in the first storage unit 13a ( Step S107).

  In step S107, if there is no information on the access point whose SSID matches and the MAC address does not match in the first storage unit 13a (step S117: No), the information in the second storage unit 13b is confirmed. (Step S108).

  In step S108, if information about the access point whose SSID matches and whose MAC address does not match is confirmed in the second storage unit 13b (step S108: Yes), the information about the newly stored access point 20 is obtained. J20 is moved to and stored in the second storage unit 13b (step S109). Then, control unit 14 determines that access point 20 corresponding to moved and stored information J20 is a public access point (step S110).

  In step S108, if there is no information on the access point whose SSID matches and the MAC address does not match in the second storage unit 13b (step S108: No), the flow ends.

  Also, in step S107, when information on the access point whose SSID matches and whose MAC address does not match is confirmed in the first storage unit 13a (step S107: Yes), the information regarding the newly stored access point 20 is obtained. The belonging terminal information J203 in the information J20 is confirmed (step S111).

  In step S111, if the belonging terminal information J203 is equal to or larger than the predetermined value α (step S111: Yes), the information J20 regarding the access point 20 stored in the first storage unit 13a is moved to the second storage unit 13b and stored. (Step S112). Then, the control unit 14 determines that the access point 20 corresponding to the moved and stored information J20 is a public access point (step S113).

  In step S111, if the belonging terminal information J203 is smaller than the predetermined value α (step S111: No), the flow ends without moving to the second storage unit 13b.

  The value of the predetermined value α can be arbitrarily set by the user.

  In this way, the second storage unit 13b stores the mapping information that is information on the access point determined as the public access point. Then, when the communication terminal 10 connects, it can use this mapping information to connect to a public access point.

  Here, a description will be given of a case where the user operates the communication terminal 10 to display information on the public access point on the display unit 15 in the order from the communication terminal 10. For convenience of explanation, the access point 20 is determined to be a public access point, and is referred to as a public access point 20. It is assumed that a plurality of access points 20 exist.

  First, the acquisition unit 12 of the communication terminal 10 acquires its own current location information J102 using the GPS function. Next, the position information comparison unit 14c of the communication terminal 10 determines the position of the public access point 20 in each of the information J20 regarding the plurality of public access points 20 stored in the second storage unit 13b (the storage area for mapping). The information J202 is compared with the current position information J102 of the communication terminal 10, respectively. Next, the communication terminal 10 causes the display unit 15 to display the information J20 on the public access point 20 in the order close to the communication terminal 10 based on the result of the comparison.

  The contents displayed by the display unit 15 include, for example, the SSID of the public access point 20, the distance from the communication terminal 10 to the public access point 20, the position of the public access point 20, the position of the communication terminal 10, and the public viewed from the communication terminal 10. For example, the direction of the access point 20.

  That is, the display unit 15 displays information J20 regarding the public access point 20, the distance from the communication terminal 10 to the public access point 20, the position information J202 of the public access point 20, the position information J102 of the communication terminal 10, and the communication terminal 10. At least one of the directions of the public access points 20 may be displayed. However, the display method and display contents are uniquely determined by the user.

  Even if the access point is not determined to be a public access point, an access point to which the user has operated (connected) the communication terminal by operating the communication terminal is an access point that can be used by the communication terminal. Therefore, when the communication terminal is associated with the access point, the communication terminal stores information on the associated access point in the second storage unit 13b for mapping, similarly to the public access point.

  Accordingly, not only the access point determined to be a public access point, but also the access point to which the communication terminal has been connected can be stored in the communication terminal together with the location information.

  Further, in this example, when the SSID matches, the MAC address does not match, and the terminal information belonging to the access point is equal to or greater than a predetermined value α, the corresponding access point is determined to be a public access point. Not limited.

  For example, the first condition that the SSID of the access point matches the SSID of another access point (the access point already stored in the storage unit) does not match the MAC address of the access point and the MAC address of the other access point. When at least one of the second condition and the third condition in which the terminal information belonging to the access point is equal to or more than the predetermined value α is satisfied, the access point may be determined as a public access point.

  In the first embodiment, information on public access points is stored in second storage unit 13b of communication terminal 10. Therefore, when the user uses the public access point, the position information of the public access point and the position information of the user himself / herself in the information on the public access point are sequentially compared and searched to obtain, for example, the nearest public access point. The information can be displayed on the display unit 15 of the communication terminal 10. Thus, the user can easily obtain information on the public access point.

  Further, in the first embodiment, it is not necessary to construct a new system, such as installing a server outside, in order to store information on public access points.

  Further, in the first embodiment, when the communication terminal 10 communicates with the access point, information about the access point (communication information such as SSID and MAC address, position information of the communication terminal 10, and belonging terminal information) is obtained. 2 storage unit 13b. Therefore, it is not necessary to newly perform communication only to acquire information on the access point.

  Further, even when the communication terminal 10 exists outside the communicable range of the public access point, the communication terminal 10 uses the communication terminal 10 in the vicinity of the communication terminal 10 from the mapping information stored in the second storage unit 13b. A possible public access point can be searched and displayed on the display unit 15.

  In addition, the communication terminal 10 may be a mobile communication terminal having a data communication function and a GPS function by wireless LAN and 3G / LTE.

[Embodiment 2]
The second embodiment is different from the first embodiment in that the position information J102m of the communication terminal 10 corresponding to the maximum value of the reception strength Rb of the beacon is used as the position information J202 of the access point 20.

  In Embodiment 1 described above, position information J102 of communication terminal 10 when communication terminal 10 receives the beacon of access point 20 is stored in storage unit 13 as position information J202 of access point 20. At this time, the position information is obtained even when the reception intensity Rb of the beacon received by the communication terminal 10 is low. The reception strength of the beacon transmitted by the access point 20 dynamically changes due to external factors such as the communication environment. For this reason, the communication terminal 10 may not be able to receive a beacon transmitted from the access point 20 even at the same position due to a change in reception intensity due to the communication environment.

  Therefore, in the second embodiment, a beacon is received a plurality of times, and position information J102m of communication terminal 10 corresponding to the maximum value of received strength Rb of the received beacon is set as position information J202 of access point 20.

  FIG. 5 is a block diagram illustrating a communication terminal according to the second embodiment.

  As shown in FIG. 5, compared to Embodiment 1, communication terminal 10 further includes a beacon reception intensity monitoring unit 14d and a third storage unit 13c. The beacon reception intensity monitoring unit 14d monitors the reception intensity Rb of the beacon transmitted from the access point 20. The third storage unit 13c is included in the storage unit 13, and stores the position information J102 of the communication terminal 10 and the reception strength Rb of the beacon in association with each other.

  In the second embodiment, acquisition section 12 acquires position information J102 of communication terminal 10 a plurality of times. The control unit 14 sets the position information J102m of the communication terminal 10 corresponding to the maximum value of the reception intensity Rb of the beacon as the position information J202 of the access point 20.

FIG. 6 is a flowchart illustrating an operation of the communication terminal according to Embodiment 2.
FIG. 6 is a flowchart illustrating an example of determining the position information J202 of the access point 20 based on the reception strength Rb of the beacon. Other operations are the same as those in the first embodiment, and a description thereof will not be repeated.

  As shown in FIG. 6, the communication terminal 10 checks whether a beacon can be received (within a communicable range) (step S201). Next, when the communication terminal 10 is within the communicable range (step S201: Yes), the beacon reception intensity Rb is monitored by the beacon reception intensity monitoring unit 14d, and the positional information J102 of the communication terminal 10 and the beacon reception intensity are monitored. It is stored in the third storage unit 13c in association with Rb (step S202).

  Then, monitoring of the reception intensity Rb of the beacon and acquisition of the position information J102 of the communication terminal 10 are continued until it becomes impossible to receive the beacon (out of the communicable range) (step S203).

  Next, the position information J102m of the communication terminal 10 corresponding to the maximum value of the reception intensity Rb of the beacon among the reception intensity Rb of the beacon stored in the third storage unit 13c is set as the position information J202 of the access point 20. Then, the communication information J201 included in the beacon, the location information J202, and the belonging terminal information J203 are associated with each other, and the first storage unit 13a or the second storage unit 13a is performed according to the flow of the first embodiment (see FIG. 3). It is stored in the unit 13b (step S204).

  In the second embodiment, the reception intensity Rb of the beacon transmitted from the access point is monitored until the beacon cannot be received, and the position information of the communication terminal when the reception intensity Rb of the beacon is the maximum value is used as the position information of the access point. Save as Thereby, the position information of the access point can be stored as accurate as possible.

  As an index of the beacon reception strength Rb, for example, an RSSI (Received Signal Strength Indicator) of the beacon may be used, or an absolute value of a received radio wave of the beacon may be used. Another index may be used as long as the index can determine the strength of the beacon reception intensity Rb.

[Embodiment 3]
In the third embodiment, the method of using the above-described IEEE 802.11 frame (see FIG. 4) is devised so that even when the communication terminal is out of the communication range of the access point, the IEEE 802.11 frame of another communication terminal is used. , The access point is detected.

  The process from detection of an access point to storage of the location information of the access point will be described with reference to FIGS.

FIG. 7 is a diagram illustrating an access point and a plurality of communication terminals.
FIG. 8 is a flowchart illustrating an operation of the communication terminal according to Embodiment 3.

  As shown in FIG. 7, consider a case where there are a plurality of communication terminals such as one access point 20, communication terminal 10a, communication terminal 10b, and communication terminal 10c.

  When the communication terminal 10a is outside the communicable range 20r of the access point 20, it cannot receive the beacon transmitted by the access point 20, and stores the position information J202 of the access point 20 in the communication terminal 10a. Cannot save.

  On the other hand, the communication terminal 10b and the communication terminal 10c are within the communicable range 20r. When the communication terminal 10b or the communication terminal 10c belongs to the access point 20 and performs data communication, an IEEE 802.11 frame is transmitted from the communication terminal 10b or the communication terminal 10c to the access point 20.

  The MAC address of the destination is stored in the IEEE 802.11 header in the IEEE 802.11 frame. For this reason, the communication terminal 10a receives the IEEE802.11 frame transmitted from the communication terminal 10b or the communication terminal 10c to the access point 20, confirms the information of the MAC address of the transmission destination, and checks the communication range of the access point 20. It is possible to recognize that there is an access point nearby even when outside of 20r.

Next, the operation flow will be described.
As shown in FIG. 8, the communication terminal 10a checks whether it is within the communicable range 20r of the access point 20 (step S301).

  If the communication terminal 10a is outside the communicable range 20r of the access point 20 (step S301: Yes), the IEEE 802 in the IEEE 802.11 frame transmitted by another communication terminal such as the communication terminal 10b or the communication terminal 10c. .11 header is confirmed (step S302). If the communication terminal 10a is within the communicable range 20r of the access point 20 (step S301: No), the communication terminal 10a ends this flow.

  When an unspecified number of communication terminals belong to the access point 20, the access point 20 is likely to be a public access point. Therefore, the communication terminal 10a checks whether a specific number of communication terminals are communicating with the access point 20 based on the contents of the IEEE 802.11 header (step S303).

  The communication terminal 10a ends the flow when a specific number of communication terminals are not communicating with the access point 20 based on the content of the IEEE 802.11 header (step S303: No).

  When a specific number of communication terminals are communicating with the access point 20 based on the contents of the IEEE 802.11 header (step S303: Yes), the communication terminal 10a acquires the position information J102 of the communication terminal 10a and obtains the first storage unit 13a. The information is stored as the position information J202 of the access point 20 in the (backup storage area) (step S304).

  In step S304, the communication terminal 10a cannot receive the beacon transmitted from the access point 20, and thus cannot acquire the SSID. Therefore, the information stored in the first storage unit 13a is only the MAC address of the access point 20 and the position information J202.

  Also, since there is no SSID information, it is difficult to determine the access point 20 as a public access point. For this reason, the MAC address and the position information J202 are stored in the first storage unit 13a (backup storage area) instead of the second storage unit 13b (mapping storage area).

  In step S304, the communication terminal 10a stores the information J20 regarding the access point 20 with the SSID unknown. Thereafter, when the communication terminal 10a enters the communicable range 20r of the access point 20 (step S305: Yes), the communication terminal 10a receives the beacon, and the communication information on the access point 20 including the SSID and the MAC address. J201 is acquired (step S306).

  Next, the communication terminal 10a checks whether the same MAC address as the MAC address acquired in step S306 exists in the storage unit 13 including the first storage unit 13a and the second storage unit 13b (step S307). ). Thereby, it is confirmed whether the access point corresponding to the acquired MAC address is the same access point as the access point with which another communication terminal was communicating in step S302.

  When the same MAC address is confirmed (step S307: Yes), the communication terminal 10a updates information such as the SSID of the access point corresponding to the same MAC address (step S308). Thereby, it is possible to prevent information about the access point from being duplicated.

  If the same MAC address is not confirmed (step S307: No), the flow ends.

  In this example, the determination as to whether the access point 20 is a public access point is made based on the two communication terminals 10b and 10c. You can make settings.

  In this way, even when a communication terminal exists outside the communicable range of the access point, by confirming the IEEE 802.11 frame transmitted from another communication terminal communicating with the access point, it is possible to place the public terminal nearby. It can recognize that an access point exists.

  In addition, information about the access point including the access point which is likely to be a public access point and the access point to which the communication terminal has been connected, including the position information of the access point, is stored in the communication terminal and used as a part of the mapping information. Can be.

  It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist.

10, 10a to 10c communication terminal 11 radio unit 12 acquisition unit 13 storage unit 13a first storage unit 13b second storage unit 13c third storage unit 14 control unit 14a information synthesis unit 14b belonging Number monitoring unit 14c Position information comparing unit 14d Beacon reception intensity monitoring unit 15 Display unit 20, 30 Access point 20r Communication range Rb Beacon reception intensity J20, J30 Access point information J201, J301 Communication Information J102, J102m, J202, J302 ... location information J203, J303 ... belonging terminal information

Claims (7)

An acquisition unit that acquires information about the communication device from the communication device,
A storage unit that stores the communication device and information about the communication device in association with each other,
A control unit that determines the communication device as a public access point based on the information on the communication device and information on another communication device already stored in the storage unit,
Equipped with a,
Each of the information on the communication device and the information on the other communication device includes communication information and belonging terminal information,
The communication information is information for communicating with a communication device, including at least one of an SSID (Service Set Identifier) and a MAC (Media Access Control address) address,
The belonging terminal information is the number of communication terminals belonging to the communication device,
The control unit includes:
A first condition that the SSID of the communication device matches the SSID of the other communication device, a second condition that the MAC address of the communication device does not match the MAC address of the other communication device, When the belonging terminal information satisfies at least one of the third conditions equal to or more than a predetermined value, the communication device is determined to be a public access point.
Communication terminal. The storage unit has a first storage unit and a second storage unit,
Information on the other communication device is stored in the first storage unit,
According to the determination, information on the communication device determined to be a public access point is stored in the second storage unit.
The communication terminal according to claim 1. The information related to the other communication device is stored in the first storage unit in advance or obtained from the other communication device before acquiring the information related to the communication device , and stored in the first storage unit.
The communication terminal according to claim 2. The obtaining unit obtains position information of the communication terminal,
The control unit, the position information of the communication terminal as the position information of the communication device, save the communication information of the communication device and the position information and the belonging terminal information in the storage unit in association with each other,
The communication terminal according to claim 1 . Further comprising a reception intensity monitoring unit that monitors the reception intensity of the signal transmitted from the communication device,
The acquisition unit acquires the position information of the communication terminal a plurality of times,
The storage unit stores the reception strength and the location information of the communication terminal in association with each other,
The control unit, the position information of the communication terminal corresponding to the maximum value of the reception intensity as the position information of the communication device,
Communication terminal according to any one of claims 1-4. At least one of information on the communication device, a distance from the communication terminal to the communication device, position information of the communication device, position information of the communication terminal, and direction information of the communication device as viewed from the communication terminal. Further comprising a display unit for displaying
The communication terminal according to any one of claims 1 to 5 . Obtaining information about the communication device from the communication device;
Storing the communication device and the information related to the communication device in a storage unit in association with each other;
Judging the communication device as a public access point based on the information on the communication device and information on another communication device already stored in the storage unit,
Equipped with a,
Each of the information on the communication device and the information on the other communication device includes communication information and belonging terminal information,
The communication information is information for communicating with a communication device, including at least one of an SSID (Service Set Identifier) and a MAC (Media Access Control address) address,
The belonging terminal information is the number of communication terminals belonging to the communication device,
The step of determining the communication device as a public access point,
A first condition that the SSID of the communication device matches the SSID of the other communication device, a second condition that the MAC address of the communication device does not match the MAC address of the other communication device, When the belonging terminal information satisfies at least one of a third condition that is equal to or greater than a predetermined value, the method further includes a step of determining the communication device as a public access point.
Method.

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