JP2012109641A - Program for selecting network for call, portable terminal and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a program, a portable terminal and a method for making a call, by automatically selecting whether to make a call using an Internet network via a wireless LAN or to make a call using a mobile phone network, without user's intentional activation.SOLUTION: A calling input section 30 of a portable terminal 10 receives a calling operation from a user through a common interface between a call using an Internet network via a wireless LAN and a call using a mobile phone network. When it is determined that the radio wave state of the wireless LAN is favorable and that the portable terminal 10 is not moving, call processing is executed using the Internet network via the wireless LAN. When it is determined that the radio wave state of the wireless LAN is not favorable, however, call processing is executed using the mobile phone network (3G).

Description

  The present invention relates to a program, a portable terminal, and a method for selecting a network for a call.

  In recent years, as mobile terminals, calls using the Internet network via wireless LAN have become common due to the spread of smartphones. For example, as shown in Non-Patent Document 1, when an application for IP phone is used, it is possible to make a call with no charge when calling from a mobile terminal.

  In addition, such a portable terminal can conventionally perform a normal call by using a mobile phone network such as a third generation mobile communication system, separately from the wireless LAN Internet network.

Skype Technology, “Skype”, [online], [October 6, 2010 search], Internet <URL: http://www.skype.com/intl/en/home/>

  However, even if there is an application that uses the Internet network via such a wireless LAN, the user consciously selects an application that uses the Internet network via this wireless LAN when making a call. And have to start. If this is forgotten, software that uses the mobile phone network is activated for normal calls.

  For the user, there is a case where there is a merit that a call charge is free if the call is made by an application using the Internet network via a wireless LAN.

  The present invention automatically selects whether to make a call using the Internet network via a wireless LAN or to make a call using a mobile phone network without intentional activation by the user. It is an object of the present invention to provide a program, a mobile terminal, and a method for making a call.

  The present invention provides the following solutions.

The invention according to the first feature includes a mobile phone communication unit for accessing a mobile phone network,
A wireless LAN communication unit for accessing a wireless LAN connected to the Internet network;
A mobile terminal comprising: a call input unit that receives a call operation;
A wireless LAN radio wave state determining means for determining a radio wave state of the wireless LAN when the call input unit receives a call;
Internet network call execution means for executing call processing using the Internet network when the wireless LAN radio wave condition determination means determines that the radio wave condition is good;
Provided is a program for causing mobile phone call execution means to execute call processing via the mobile phone communication unit when the wireless LAN radio wave state determination means determines that the radio wave condition is not good. To do.

  According to the first aspect of the invention, when a call is received, the radio wave condition of the wireless LAN is determined, and if the radio wave condition is determined to be good, the call process using the Internet network is executed. Then, when it is determined that the radio wave condition is not good, the calling process via the mobile phone communication unit is executed.

  Therefore, even if the user does not intentionally start up, a program for automatically making a call by automatically selecting whether to make a call using the Internet network or to make a call using the mobile phone network Can be provided.

  The invention according to the first feature exhibits the same operations and effects not only in the user terminal but also in the method and program in the category of the invention.

  The invention according to the second feature is the invention according to the first feature, and further, when the call input unit accepts a call, the call by the mobile phone communication unit and the wireless LAN communication A program for functioning as an input unit configured by an input interface common to both outgoing calls by a unit is provided.

  Therefore, the user simply makes a call using a single input interface common to both parties without selecting whether to make a call using the Internet network or a mobile phone network via a wireless LAN. It is possible to automatically select an appropriate network. Here, the common one input interface may be an interface provided by one common application.

The invention according to the third feature is the invention according to the first or second feature,
When the call input unit accepts a call, the call input unit functions as a mobile phone network radio wave state determination unit that determines a radio wave state of the mobile phone network,
Even when the mobile phone network radio wave condition determining means determines that the radio wave condition is good, the Internet network call execution means determines that the wireless LAN radio wave condition determining means is good. In this case, the mobile phone call execution means does not execute the call processing, and the Internet network call execution means provides a program for causing the call processing using the Internet network to function.

  Therefore, even when a call can be made via the mobile phone network, a call using the Internet network is preferentially made via the wireless LAN.

The invention according to the fourth feature is an invention according to the first to third features,
It functions as an acceleration detector that detects acceleration or speed applied to the mobile terminal, and
Depending on the magnitude of the acceleration or speed detected by the acceleration detection unit, the Internet network call execution means may determine that the wireless LAN radio wave state determination unit determines that the radio wave state is good. There is provided a program for allowing the mobile phone call execution means to perform the call processing via the mobile phone communication unit without performing the call processing using the Internet network.

  Since the area where the radio wave of the wireless LAN can reach is usually narrower than the area where the radio wave of the mobile phone network can reach, if the mobile terminal is moving at a predetermined speed, the calling process is performed using the wireless LAN. In some cases, radio waves cannot be reached during a call and the call cannot be made. Therefore, as in the invention according to the fourth feature, it is possible to avoid this problem by prioritizing the call through the mobile phone network according to the magnitude of acceleration or speed.

The invention according to the fifth feature is an invention according to the first to fourth features,
When the wireless LAN radio wave condition determining unit determines that the radio wave condition is not good during a call by the calling process using the Internet network, the mobile phone call executing unit uses the Internet network. A call connection request is made to a telephone number during a call, and when the call connection is completed, the mobile terminal further functions as a network switching means for switching to a call using the mobile phone network at a predetermined timing. Program.

  Therefore, after the call processing using the Internet network is performed, if the radio wave condition of the wireless LAN is not good, a call connection using the mobile phone network is also performed at the other end of the call. In addition, a call using the Internet network can be switched to a call using the mobile phone network. Here, it is desirable that the time for switching the network is as short as possible so as not to be aware that the user during the call has switched.

The invention according to a sixth aspect includes a mobile phone communication unit for accessing a mobile phone network;
A wireless LAN communication unit for accessing a wireless LAN connected to the Internet network;
A mobile terminal comprising: a call input unit that receives a call operation;
Wireless LAN radio wave state determining means for determining the radio wave state of the wireless LAN;
Internet network call setting means for setting in advance so as to execute call processing using the Internet network when the wireless LAN radio wave state determination means determines that the radio wave condition is good;
When the wireless LAN radio wave state determining means determines that the radio wave state is not good, the call input unit executes a call process via the mobile phone communication unit when receiving a call. A program for functioning as a call setting unit for a mobile phone set in advance is provided.

  According to the sixth aspect of the invention, when the radio wave condition of the wireless LAN is determined and it is determined that the radio wave condition of the wireless LAN is good, a call using the Internet network is accepted when a call is received. It is preset to execute call processing. Then, when it is determined that the radio wave condition is not good, it is set in advance so as to execute the calling process via the mobile phone communication unit when the call is received.

  Therefore, unlike the invention according to the first feature, the mobile terminal confirms the radio wave state in advance before the call operation, instead of checking the radio wave state in response to the call operation from the user. It is set whether to make a call through the Internet network or the cellular phone network via the LAN. When a call operation is performed, the call processing can be performed using the set communication unit.

  According to the present invention, it is automatically determined whether to make a call using the Internet network via a wireless LAN or to make a call using a mobile phone network without intentional activation by the user. It is possible to provide a portable terminal, a method, and a program for selecting and making a call.

FIG. 1 is a functional block diagram of the mobile terminal 10. FIG. 2 is a diagram illustrating a flow of the first process executed by the mobile terminal 10. FIG. 3 is a diagram illustrating a call interface displayed on the mobile terminal 10. FIG. 4 is a diagram illustrating a call interface (during movement) displayed on the mobile terminal 10. FIG. 5 is a diagram illustrating a flow of the second process executed by the mobile terminal 10. FIG. 6 is a conceptual diagram illustrating a network to be selected when the radio wave conditions of the networks overlap. FIG. 7 is a diagram illustrating a flow of the third process executed by the mobile terminal 10.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. This is merely an example, and the technical scope of the present invention is not limited to this.

[Description of each function]
FIG. 1 is a functional block diagram of the mobile terminal 10. A description will be given with reference to FIG.

  The mobile terminal 10 is a terminal having a telephone call function and a function of performing data communication with the outside, and a terminal that can be connected to a mobile phone network such as a third generation mobile communication system and a wireless LAN Internet network. It is. The mobile phone network is not limited to the third generation mobile communication system, and may be a network network (private line network or the like) using a communication line different from the Internet network.

  The mobile terminal 10 is a portable computer terminal having an OS (Operating System). For example, in addition to a mobile phone, a portable information terminal, a computer (personal computer), a television, a telephone, a smartphone, a netbook terminal, a slate terminal, It may be a portable information home appliance such as an electronic book terminal, a portable music player, and a portable content playback / recording player.

  The mobile terminal 10 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like as the control unit 20, and an HDD (Hard Disk Drive), SSD (Solid) as the storage unit. State Drive) or both. The call input unit 30 includes a touch panel unit that displays an image and receives an input from the user.

  The mobile terminal 10 includes a wireless LAN communication unit 51 and a mobile phone communication unit 52 as the communication unit 50. The wireless LAN communication unit 51 may be a wireless device (such as a device compatible with WiFi (Wireless Fidelity)) conforming to IEEE 802.11. The mobile phone communication unit 52 is a wireless device compliant with the IMT-2000 standard such as a third generation mobile communication system. The wireless radio wave range of the wireless LAN is a radio wave range of each network distinguished by SSID (Service Set Identifier).

  The mobile terminal 10 includes an acceleration device that can measure the acceleration received by the mobile terminal 10 as the acceleration detection unit 40. The acceleration detection unit 40 is preferably capable of detecting acceleration in the three-axis directions by using a semiconductor piezoresistive type. The acceleration detection unit 40 may comprehensively determine whether the mobile terminal 10 is moving with speed or acceleration by using an acceleration device and a GPS (Global Positioning System) device in combination.

  The control unit 20 includes a wireless LAN radio wave state determination unit 21, a mobile phone network radio wave state determination unit 22, an Internet network call execution unit 23, and a mobile phone call execution unit 24. The function of each means will be described with reference to FIG.

  The application is a software program that can be activated on the mobile terminal 10, and may be an application installed in the mobile terminal 10, for example. The application is normally activated by the user operating an icon or the like displayed on the display unit of the mobile terminal 10. When the application is activated, a user interface is displayed and accepts input from the user. In particular, the application described in the following embodiment is an application for an IP phone having a call function using an Internet network via a wireless LAN. In the case of an input interface that is common to both a call made by the mobile phone communication unit 52 and a call made by the wireless LAN communication unit 51, the same telephone application may be used for both.

[Flowchart of first process]
FIG. 2 is a flowchart of the first process executed by the mobile terminal 10.

  First, the mobile terminal 10 receives a call operation from the call input unit 30 from the user (step S10). When the user makes a call, as shown in the example of FIG. 3, an interface for calling is displayed on the display unit of the mobile terminal 10-a, and the input of the telephone number is accepted by the touch panel. The telephone number can be entered by entering a number or selecting a telephone number from the address book. In addition, a telephone number may be selected from outgoing call history, incoming call history, and the like.

  Here, the interface for making a call is a common interface for the call made by the wireless LAN communication unit 51 and the call made by the mobile phone communication unit 52. That is, when a user makes a call, an interface for receiving an input of a call destination is not selected by selecting a different interface depending on each call of the wireless LAN communication unit 51 and the mobile phone communication unit 52. It is desirable that both are common.

  Next, the wireless LAN radio wave state determination means 21 refers to the radio wave radio wave state (step S11). That is, the wireless LAN radio wave state determining means 21 refers to the OS communication module for the radio LAN radio wave intensity (electric field intensity). The OS communication module determines whether the signal quality is “very good”, “good”, “bad” or the like based on the radio wave intensity received by the wireless LAN communication unit 51 of the mobile terminal 10. The wireless LAN radio wave state determination means 21 refers to the quality of this signal.

  If the wireless LAN radio wave state determining means 21 determines that the radio wave state of the wireless LAN is good (step S12: “YES”), the process proceeds to step S13. If the wireless LAN radio wave state determining means 21 determines that the radio wave state of the wireless LAN is not good (step S12: “NO”), the process proceeds to step S15.

  In step S15, the mobile phone network radio wave state judging means 22 refers to the radio wave state of the mobile phone network (step S15). That is, the mobile phone network radio wave state determination means 22 refers to the OS communication module for the radio wave strength (electric field strength) of the mobile phone network. The OS communication module determines whether the signal quality is “very good”, “good”, “bad” or the like based on the radio wave intensity received by the mobile phone communication unit 52 of the mobile terminal 10. The cellular phone network radio wave state judging means 22 refers to the quality of this signal.

  If the mobile phone network radio wave state determining means 22 determines that the radio wave state of the mobile phone network is good (step S16: “YES”), the process proceeds to step S17. That is, the cellular phone call execution means 24 performs call processing via the cellular phone communication unit using the cellular phone network after giving up on the wireless LAN call (step S17). If the mobile phone network radio wave state determining means 22 determines that the radio wave state of the mobile phone network is not good (step S16: “NO”), it is impossible to make a call on both the mobile phone network and the wireless LAN. Then, an output is made to notify the user that both radio waves are not sufficient, and the processing is terminated.

  In step S13, the acceleration detection unit 40 determines whether speed or acceleration is detected. That is, the acceleration detection unit 40 receives a predetermined acceleration and moves at a constant speed or moves at a predetermined acceleration in order to determine whether the mobile terminal 10 is moving at this time. Determine whether you are doing. The speed may be determined from past accelerations or travel distances by GPS.

  When the acceleration detection unit 40 determines that the velocity or acceleration is detected (step S13: “YES”), the process proceeds to step S17. That is, if it is determined that the speed or acceleration is detected, it is determined that the mobile terminal 10 is moving, and the process proceeds to step S17.

  In step S <b> 17, the mobile phone call execution means 24 performs a call processing via the mobile phone communication unit 52.

  As described above, when the mobile terminal 10 determines that the mobile terminal 10 is moving and performs call processing by the mobile phone network, the mobile terminal 10 is displayed on the display unit of the mobile terminal 10-b in FIG. May detect that the mobile phone network (3G) has been selected in the outgoing call by detecting the movement.

  Usually, the area where the radio wave strength of the wireless LAN is good is narrower than the area where the radio wave strength of the mobile phone network is good. Therefore, when the mobile terminal 10 is moving, a call using the mobile phone network is made. By performing the process, the call after the call is not interrupted. Here, even if the speed and acceleration are detected, it may be determined that the wireless LAN is connected as long as the person walks at a speed (3 km / h).

  When the acceleration detection unit 40 determines that the speed or acceleration is not detected (step S13: “NO”), the Internet network call execution means 23 makes a call using the Internet network via the wireless LAN. Processing is performed (step S14). That is, it is determined that the user has hardly moved, and the user selects a call using the wireless LAN.

  The IP phone application is a call application using the Internet network via a wireless LAN, and can be activated on the mobile terminal 10. Since the application for IP phone uses the Internet network and does not use the mobile phone network of the normal third generation mobile communication system, the mobile terminal operator and the application provider do not collect the call charge.

  It is possible for the user to set in advance that the call processing is performed using the IP phone application as much as possible by the first processing as described above. As shown in FIG. 4, the mobile terminal 10 displays an interface that accepts an input of a network selection rule when making a call from a user.

  When the user selects a call charge saving rule, the mobile terminal 10 executes the first process and uses an algorithm for saving the mobile terminal call charge as much as possible by using an application for IP phone that does not incur a call charge. To do. As shown in FIG. 4, “Do not use wireless area even if walking” is a setting for selecting a cellular phone network as a network even when walking at a speed of walking. When this is set in the acceleration detection unit 40, the mobile phone network is selected even at a walking speed.

[Second Processing Flowchart]
FIG. 5 is a flowchart of the second process executed by the mobile terminal 10.
Unlike the first process, the second process is a process of setting a network in advance before receiving a call operation, rather than selecting a network after receiving a call operation.

  First, the wireless LAN radio wave state determination means 21 refers to the radio wave radio wave state (step S21). The content of this process is the same as step S11 of the first process. Henceforth, the process of step S22 is the same as the process of step S12, and the process of step S25 is the same as step S15.

  If it is determined that the radio wave intensity of the wireless LAN is sufficient (step S22: “YES”), the Internet network call setting unit 25 is set to perform call processing using the Internet network via the wireless LAN. (Step S23). The setting here is, for example, a prior setting for making a call by selecting a set network when a call operation is made from a user to a common interface for making a call. .

  When it is determined that the wireless LAN radio wave intensity is not sufficient (step S22: “NO”), the mobile phone network radio wave state determination means 22 refers to the radio wave state of the mobile phone network (step S25). When the mobile phone network radio wave state determination means 22 determines that the strength of the mobile phone network is sufficient (step S26: "YES"), the Internet network call setting means 25 sets the mobile phone communication unit 52. (Step S27). If the mobile phone network radio wave state determining means 23 determines that the strength of the mobile phone network is not sufficient (step S26: “NO”), the network cannot be set, and the process returns to step S21.

  Next, the call input unit 30 determines whether or not there is a call operation from the user (step S24). If there is no call operation from the user (step S24: “NO”), the process proceeds to step S21. If there is a call operation from the user (step S24: “YES”), the process proceeds to step S28.

  In step S28, the acceleration detection unit 40 determines whether a predetermined speed or acceleration is detected. The content of this process is the same as the process of step S13. Here, when it is determined that the acceleration detection unit 40 is detecting a predetermined speed or acceleration (step S28: “YES”), a call process is performed via the mobile phone communication unit 52. . This process is the same as step S17. When the acceleration detection unit 40 determines that the speed or acceleration is not detected (step S28: “NO”), the calling process set in step S23 or step S27 is executed (step S30).

  Next, network selection according to the radio wave condition will be described with reference to FIG. In area 2, the wireless LAN radio wave area is area 5, and the mobile phone network radio wave area is area 7. In this case, both the area 5 and the area 7 have sufficient radio wave intensity at the position of the mobile terminal 10-d, and both radio wave reception marks are good.

  In this case, both networks can be selected, but by executing the first process and the second process, the Internet network based on the wireless LAN is preferentially selected. In area 3, the radio wave intensity of area 5 which is the radio wave area of the wireless LAN is sufficient, while the radio wave intensity of area 7 which is the radio wave area of the cellular phone network is not sufficient. .

[Flowchart of third process]
Next, the third process will be described with reference to FIG. The third process is a process of switching the network to the mobile phone network when the radio wave condition of the wireless LAN becomes poor afterwards during a call using the Internet network via the wireless LAN.

  This process is started when the Internet network call execution means 23 performs a call process using the Internet network via a wireless LAN. The wireless LAN radio wave state determining means 21 refers to the radio wave state of the wireless LAN (step S51), and determines whether the radio wave intensity is sufficient at present (step S52). If it is determined that the radio wave intensity is sufficient, the process returns to step S51 (step S52: “YES”). When it is determined that the wireless LAN radio wave intensity is not sufficient (step S52: “NO”), the mobile phone network radio wave determination means 22 refers to the radio wave state of the mobile phone network (step S53).

  If the mobile phone network radio wave determination means 22 determines that the radio wave intensity of the mobile phone network is not sufficient (step S54: “NO”), the process returns to step S51. In this case, network switching is impossible. When the mobile phone network radio wave determination means 22 determines that the radio wave intensity of the mobile phone network is sufficient (step S54: "YES"), the mobile phone call execution means 24 performs the Internet network call execution means. From 23, the telephone number of the other party in the call is acquired, and a call connection request is made to the other party using the mobile phone network (step S55).

  If the mobile terminal 10 of the other party that has received the call connection request has good radio waves from the mobile phone network, the call connection is completed. Here, the call connection may be made without outputting the call connection request to the mobile terminal 10, but the fact that the call connection request has been made is output by sound or display, and the user who is the other party An input operation for accepting the call connection from the user may be accepted. The call connection request cannot be completed if the mobile terminal 10 of the other party that has received the call connection request has poor radio wave from the mobile phone network or if the other party's user refuses to accept.

  When the mobile phone network communication unit 52 completes the call connection of the mobile phone network (step S56: “YES”), the call using the mobile phone network is changed from the call using the Internet network via the wireless LAN. Then, the network is switched (step S57). The network switching process is a call using the mobile phone network from a call using the Internet network via the wireless LAN at a predetermined timing in a situation where the wireless LAN is connected and also connected to the mobile phone network. Switch to

  For example, in a situation where an IP phone application using the Internet network via a wireless LAN and a telephone application using a mobile phone network are activated in a dual state, both voice lines are connected. However, it is assumed that the voice input by the user in the conversation is input only from the IP phone application.

  Here, the user interface of the IP phone application is displayed on the mobile terminal 10, and the interface of the phone application is hardly displayed. In this state, the user interface is switched from the IP telephone application to the telephone application using the mobile phone network, and at the same time, the voice input made by the user in the conversation is switched from the IP telephone application to the telephone application.

  After switching the network, a call using the Internet network is disconnected via a wireless LAN after a predetermined time. For example, the application is terminated by closing the application for the IP phone.

  The means and functions described above are realized by a computer (including a CPU, an information processing apparatus, and various terminals) reading and executing a predetermined program. The application program is provided in a form recorded on a computer-readable recording medium such as a flexible disk, CD (CD-ROM, etc.), DVD (DVD-ROM, DVD-RAM, etc.), for example. In this case, the computer reads the application program from the recording medium, transfers it to the internal storage device or the external storage device, stores it, and executes it. The program may be recorded in advance in a storage device (recording medium) such as a magnetic disk, an optical disk, or a magneto-optical disk, and provided from the storage device to a computer via a communication line.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to these embodiment mentioned above. The effects described in the embodiments of the present invention are only the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

  10 mobile terminals, 30 call input units, 40 acceleration detection units, 51 wireless LAN communication units, 52 mobile phone communication units

Claims (8)

A mobile phone communication unit for accessing the mobile phone network;
A wireless LAN communication unit for accessing a wireless LAN connected to the Internet network;
A mobile terminal comprising: a call input unit that receives a call operation;
A wireless LAN radio wave state determining means for determining a radio wave state of the wireless LAN when the call input unit receives a call;
Internet network call execution means for executing call processing using the Internet network when the wireless LAN radio wave condition determination means determines that the radio wave condition is good;
A program for functioning as a mobile phone call execution means for executing a call process via the mobile phone communication unit when the wireless LAN radio wave state determination means determines that the radio wave state is not good.   When the call input unit accepts a call, as an input means configured by a common input interface for both the call by the mobile phone communication unit and the call by the wireless LAN communication unit, The program according to claim 1 for causing the program to occur. When the call input unit accepts a call, the call input unit functions as a mobile phone network radio wave state determination unit that determines a radio wave state of the mobile phone network,
Even when the mobile phone network radio wave condition determining means determines that the radio wave condition is good, the Internet network call execution means determines that the wireless LAN radio wave condition determining means is good. In this case, the mobile phone call execution means does not execute call processing, and the Internet network call execution means allows the call processing using the Internet network to function. The program described in. It functions as an acceleration detector that detects acceleration or speed applied to the mobile terminal, and
Depending on the magnitude of the acceleration or speed detected by the acceleration detection unit, the Internet network call execution means may determine that the wireless LAN radio wave state determination unit determines that the radio wave state is good. 4. The call processing unit according to claim 1, wherein the mobile phone call execution means functions the call processing through the mobile phone communication unit without performing the call processing using the Internet network. 5. program.   When the wireless LAN radio wave condition determining unit determines that the radio wave condition is not good during a call by the calling process using the Internet network, the mobile phone call executing unit uses the Internet network. A call connection request is made to a telephone number during a call, and when the call connection is completed, the mobile terminal further functions as a network switching means for switching to a call using the mobile phone network at a predetermined timing. The program according to any one of claims 1 to 4. A mobile phone communication unit for accessing the mobile phone network;
A wireless LAN communication unit for accessing a wireless LAN connected to the Internet network;
A mobile terminal comprising: a call input unit that receives a call operation;
Wireless LAN radio wave state determining means for determining the radio wave state of the wireless LAN;
Internet network call setting means for setting in advance so as to execute call processing using the Internet network when the wireless LAN radio wave state determination means determines that the radio wave condition is good;
When the wireless LAN radio wave state determining means determines that the radio wave state is not good, the call input unit executes a call process via the mobile phone communication unit when receiving a call. A program for functioning as a call setting unit for a mobile phone set in advance. A mobile phone communication unit for accessing the mobile phone network;
A wireless LAN communication unit for accessing a wireless LAN connected to the Internet network;
A call input unit that accepts a call operation;
A wireless LAN radio wave state determining means for determining a radio wave state of the wireless LAN when the call input unit receives a call;
Internet network call execution means for executing call processing using the Internet network when the wireless LAN radio wave condition determination means determines that the radio wave condition is good;
A mobile terminal comprising: a mobile phone call execution means for executing a call process via the mobile phone communication unit when the wireless LAN radio wave state determination means determines that the radio wave state is not good. A mobile phone communication unit for accessing the mobile phone network;
A wireless LAN communication unit for accessing a wireless LAN connected to the Internet network;
A call input unit that accepts a call operation, and a method executed by a portable terminal comprising:
Determining the radio wave condition of the wireless LAN when the call input unit accepts a call;
A step of performing a calling process using the Internet network when it is determined that the radio wave state is good in the step of determining the radio wave state of the wireless LAN;
And a step of executing a calling process via the mobile phone communication unit when it is determined that the radio wave state is not good in the step of determining the radio wave state of the wireless LAN.

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