JP2000184039A - Call back device and its method and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a call back device comparing a call rate required for a call when a first radio terminal calls a second radio terminal 1 with a call rate when the second radio terminal calls the first radio terminal and automatically making a call again from the second radio terminal when the latter is inexpensive, and to provide a call back method and a storge medium. SOLUTION: A radio communication terminal unit has a setting information storage part 16 where information on a call rate received from a network at the time of registering a position to a service zone is stored, and a control part 15 comparing the call rate required for a calling side at the time of an incoming call with the call rate required when an incoming side calls the calling side and making the call again from the incoming side when the latter call rate is inexpensive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a callback apparatus, a callback method, and a storage medium, and more particularly, to wireless communication within a service zone controlled by a system other than the system to which the user has registered. The present invention relates to a callback apparatus, a callback method, and a storage medium that are applicable to a roaming-capable wireless communication system and are suitable for making a low-cost call.

[0002]

2. Description of the Related Art Conventionally, a roaming-capable radio communication system (PDC (Personal Digital Ceiling)) has been proposed.
llular: Digital car phone system), PHS (P
personal Handyphone System:
For example, when a call is made to a mobile terminal that has moved under another wireless communication system in a simplified cellular phone, etc.), the calling party is charged.

[0003]

However, the above-mentioned prior art has the following problems. That is,
Even if the call cost is lower when the call is made again from the wireless communication system to which the user roamed, the charge is made in the wireless communication system from which the call was made. However, when moving into the area of another wireless communication system, there is a problem that a high call rate may eventually be charged to a company when a call is made to the person.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has been made in consideration of the above-described circumstances. A call-back method that compares a call charge when a call is made to a terminal and, if the latter is cheaper, provides a call-back system for automatically re-calling from the second wireless terminal, thereby reducing the call charge. It is an object to provide an apparatus, a callback method, and a storage medium.

[0005]

In order to achieve the above object, the present invention according to claim 1 is a callback device for making a call at a low call charge, wherein the call charge applied to the calling side at the time of receiving a call. And a communication control means for comparing the call rate when the call is made from the called side to the calling side, and re-starting the call from the called side when the latter call rate is low.

In order to achieve the above object, the present invention according to claim 2 comprises a plurality of radio cells each having a plurality of radio base stations connected to a radio network controller via a wired communication network. A wireless terminal that provides a communication service by providing a wireless connection with a roaming-capable wireless terminal that performs wireless connection and communicates in a service zone that is controlled by a system other than the system that has been subscribed and registered, as well as within the service zone that is registered. It is characterized by being applicable to a communication system.

In order to achieve the above object, the present invention according to claim 3 further comprises a storage means for storing information relating to a call charge, wherein the communication control means is adapted to register the call charge when the location is registered in the service zone. Information from a communication network and stored in the storage means.

According to a fourth aspect of the present invention, the communication control means stores country information, call rate information, and currency rate in the storage means as information on the call rate. Features.

In order to achieve the above object, the invention according to claim 5 is characterized in that the calling side is a wireless terminal.

In order to achieve the above object, the invention according to claim 6 is characterized in that the calling side is a wired terminal.

In order to achieve the above object, the present invention according to claim 7, wherein the communication control means transmits or receives a call to or from a call charge database on a communication network in which information on the call charge is stored. It can be accessed at the time of a call.

In order to achieve the above object, the present invention according to claim 8 is characterized in that the communication control means always determines whether or not to call back for an incoming call.

[0013] In order to achieve the above object, the present invention as set forth in claim 9 is characterized in that the mode can be set as to whether or not the communication control means determines whether or not to call back for an incoming call. Features.

According to a tenth aspect of the present invention, in order to achieve the above object, the communication control means stores caller information for determining whether or not to call back for an incoming call. In addition, it is possible to determine whether or not to call back in the case of an incoming call corresponding to the caller information.

[0015] To achieve the above object, the present invention according to claim 11 is characterized in that it is applicable to a wideband code division multiple access mobile communication system.

To achieve the above object, the present invention according to claim 12 is characterized in that it is applicable to a narrowband code division multiple access mobile communication system.

In order to achieve the above object, the present invention according to claim 13 is a callback method applied to a callback method for making a call at a low call charge, wherein the call is applied to the calling side when receiving a call. A communication control step is provided in which a charge is compared with a call charge when a call is made from the called side to the calling side, and when the latter call charge is low, the call is re-started from the called side.

According to another aspect of the present invention, there is provided a wireless communication system comprising a plurality of wireless cells each having a plurality of wireless base stations connected to a wireless network controller via a wired communication network. Within the designated service zone,
Applicable to a wireless communication system that provides a communication service by making a wireless connection with a roaming-capable wireless terminal that performs a wireless connection and communicates even in a service zone controlled by a system other than the registered system. And

In order to achieve the above object, the present invention according to claim 15 is that, in the communication control step, information on a call charge is received from a communication network at the time of location registration in the service zone and stored in storage means. Features.

In order to achieve the above object, the present invention according to claim 16 is that, in the communication control step, country information, call rate information, and currency rate are stored in the storage means as information on the call rate. Features.

In order to achieve the above object, the present invention according to claim 17 is characterized in that the calling side is a wireless terminal.

[0022] To achieve the above object, the present invention according to claim 18 is characterized in that the calling side is a wired terminal.

In order to achieve the above object, according to the present invention, in the communication control step, when a call is made or a call is made to a call charge database on a communication network in which information regarding the call charge is stored. It can be accessed at the time of a call.

In order to achieve the above object, the present invention according to a twentieth aspect is characterized in that in the communication control step, it is determined whether or not to always call back an incoming call.

In order to achieve the above object, according to the present invention, it is preferable that a mode can be set to determine whether or not to make a callback for an incoming call in the communication control step. Features.

In order to achieve the above object, according to the present invention, in the communication control step, caller information for determining whether or not to call back an incoming call is stored in the communication control step. In addition, it is possible to determine whether or not to call back in the case of an incoming call corresponding to the caller information.

To achieve the above object, the present invention according to claim 23 is characterized in that it is applicable to a wideband code division multiple access mobile communication system.

[0028] To achieve the above object, the present invention according to claim 24 is characterized in that it is applicable to a narrowband code division multiple access mobile communication system.

According to another aspect of the present invention, there is provided a computer-readable storage medium storing a program for executing a callback method applied to a callback apparatus for making a call at a low cost. In the callback method, the charge applied to the calling party at the time of receiving a call is compared with the charge applied when a call is made from the called party to the calling party. It is characterized by having a communication control step of making a call again.

[0030]

Embodiments of the present invention will be described below with reference to the drawings.

[1] First Embodiment As a first embodiment of the present invention, an IMT2000 which is a wireless communication system which is considered on the premise of roaming.
(International Mobile Tele
Communication 2000 (Wideband CDMA (Code D))
ivision Multiple Access) shows an example of a mobile communication system.

FIG. 2 is a conceptual diagram of roaming of wireless terminal equipment in a wideband CDMA (W-CDMA) mobile communication system according to the first embodiment of the present invention. Wideband CDMA (W-CDM) according to the first embodiment of the present invention
A) The mobile communication system includes a communication network 200 and a communication carrier A.
It comprises a service zone 201, a communication carrier A wireless channel control device 202, a wireless communication terminal device (wireless terminal A) / 203, a communication carrier B service zone 211, and a communication carrier B wireless channel control device 212. It should be noted that the configuration shown in FIG. 2 is an example and is not limited to the illustrated configuration.

The function of each section will be described in detail. The service provider A service zone 201 and the service provider B service zone 211 are constituted by a combination of radio cells formed by the respective radio base stations. Are controlled by the radio line control devices 202 and 212 of each business operator. The communication network 200 is a communication network that connects the above-mentioned wireless channel control devices 202 and 212. Even when the wireless communication terminal device (wireless terminal A) 203 subscribed to the communication carrier A moves to the service zone controlled by the communication carrier B, the wireless connection becomes possible, and the basic service (outgoing / incoming / outgoing) can be performed. etc)
Is guaranteed.

FIG. 1 is a diagram showing a W according to a first embodiment of the present invention.
FIG. 2 is a functional block diagram illustrating a configuration of a wireless communication terminal device of the CDMA mobile communication system. The wireless communication terminal device of the W-CDMA mobile communication system according to the first embodiment of the present invention includes a wireless unit 11, a baseband processing unit 12, a frame disassembly unit 13, a communication application 14, a control unit 15, setting information The configuration includes a storage unit 16.

The function of each unit will be described in detail.
Manages transmission and reception of radio waves in wireless communication. The baseband processing unit 12 controls modulation and demodulation in wireless communication. The frame disassembly / assembly unit 13 manages disassembly / assembly of transmission / reception data in wireless communication in units of frames. The communication application 14 is various communication applications used for wireless communication.

The control unit 15 controls the wireless communication and the communication application based on a program stored inside the wireless communication terminal device or a program supplied from outside the wireless communication terminal device. The processing shown in the flowchart is executed. The program of the present invention is program-coded based on the flowchart of FIG. 5 described later. The setting information storage unit 16 stores various setting values (maximum transmission output value, essential communication speed) and the like and constants for various calculations, including information on call charges (see FIG. 4) which is a feature of the present invention. The storage unit.

It is to be noted that each constituent element in the claims and each part in the wireless communication terminal device of the W-CDMA system according to the first embodiment of the present invention and second and third embodiments to be described later. Are as follows. The communication control unit corresponds to the control unit 15, and the storage unit corresponds to the setting information storage unit 16. The storage medium in the claims stores a control procedure (function of the control unit 15) of the present invention for executing the callback method of the present invention.

Next, the first embodiment of the present invention configured as described above is described.
The operation in the W-CDMA mobile communication system according to the present embodiment will be described with reference to FIGS.
FIG. 3 is an explanatory diagram showing an example of a sequence for notifying call charge information at the time of executing a location registration processing sequence in the W-CDMA mobile communication system according to the first embodiment of the present invention.

Reference numeral 301 denotes a notification signal for notifying the information (network operator information, base station identification information, and the like) of the network to which the base station on the wireless communication network side belongs. Regarding the wireless communication network transmitting the broadcast signal by the activation of the wireless communication terminal device or the movement of the wireless cell, the communication channel is set (302, 303) by the trigger of the wireless communication terminal device that recognizes the necessity of the location registration process. ) And setting of an access link (304, 305). In a state where the exchange of the logical control information with the wireless communication network becomes possible, the wireless communication terminal device requests a position registration (3).
06). The wireless communication network that has received this request performs authentication processing (307, 3) on the wireless communication terminal device.
08), and confirms that the terminal is not an unauthorized terminal.

Thereafter, the wireless communication network notifies the wireless communication terminal device of the information of the call charge provided by the wireless communication network (309). After confirming that the call charge information has been normally received from the wireless communication terminal device (310), the wireless communication network side completes the terminal position registration and returns a position registration acceptance (311). Thus, the exchange of the logical information is completed, the logical link is disconnected (312, 313) by the activation of the wireless communication terminal device, and then the access link is disconnected (3).
14, 315) and disconnect the wireless line.

FIG. 4 is a diagram showing a W according to the first embodiment of the present invention.
In the CDMA mobile communication system, an explanatory diagram showing an example of information notified to the wireless communication terminal device from the wireless communication network by the call charge information notification (309) and stored in the setting information storage unit 16 inside the wireless communication terminal device. is there. In this example, country information and call rate information for that country,
The currency rates are stored as a set (country information 1, call rate information 1, currency rate 1, country information 2, call rate information 2, currency rate 2, country information 3, call rate information 3, currency rate 3,...).・), You can see the price when calling to each country. It should be noted that the information shown in FIG. 4 is an example and is not limited to the information shown.

FIGS. 8 and 9 show an example of a normal outgoing call sequence and an example of an incoming call sequence. FIG. 8 is an explanatory diagram showing an example of a normal outgoing sequence, and FIG. 9 is an explanatory diagram showing an example of a normal incoming sequence. In the case of outgoing call (801), wireless line setting and authentication processing (802-807) are performed, the wireless communication terminal device receives call charge information notified from the wireless communication network (808-809), and the call setting sequence (808). After that, the communication state (815) is established. In the case of an incoming call (901), setting of a wireless line and authentication processing (902 to 907) are performed, and a call setting sequence (90
After that, the communication state (913) is established.

FIG. 5 is a diagram showing a W according to the first embodiment of the present invention.
4 is a flowchart illustrating control of a wireless communication terminal device of the CDMA mobile communication system. When a call is activated (step S501), the control unit 15 of the wireless communication terminal device receives call charge information on the call from the wireless communication network (step S502), and notifies the call charge information as a call setting parameter. (Step S50
3). Then, the receiving-side wireless communication terminal device (step S504) receives the call charge information from the partner terminal notified as the call setting parameter (step S50).
5) If the call charge is lower when the call is re-established compared to the call charge for calling the other terminal stored in advance in the setting information storage unit 16 (memory) (step S506), the call is received. Is disconnected and the call is re-transmitted to the wireless communication terminal device that has just received the call (step S50).
7).

FIGS. 6 and 7 show an example of an outgoing call sequence and an incoming call sequence at the time of callback according to the first embodiment of the present invention. FIG. 8 is an explanatory diagram showing an example of an outgoing sequence at the time of callback, and FIG. 9 is an explanatory diagram showing an example of an incoming sequence at the time of callback. In the first embodiment of the present invention, the wireless communication terminal device on the calling side receives the charge information on the call from the wireless communication network (60).
8) Then, the information is notified to the called terminal as a parameter for call setting (610). Then, the incoming wireless communication terminal device receives a call charge for receiving the call as it is,
The call charges for re-originating from the wireless communication terminal device on the receiving side are compared, and when it is determined that the latter case is cheaper, disconnection (711) is sent instead of sending a response, and wireless communication is disconnected (712-715). I do. Then, the call is re-transmitted to the newly-received wireless communication terminal device (716 to 7).
19 ...).

The transmitting wireless communication terminal receives the disconnection (613) instead of the response, disconnects the wireless communication (614 to 617), and receives the incoming call from the transmitting wireless communication terminal (618 to 618). 620 ...). In the incoming call sequence at this time, a response to the call is naturally returned immediately, and the process smoothly proceeds to the call state.

As described above, according to the wireless communication terminal device of the W-CDMA mobile communication system according to the first embodiment of the present invention, the call charge received from the wireless communication network at the time of location registration in the service zone. The setting information storage unit 16 in which information on the calling party is stored is compared with the calling rate on the calling side when receiving a call and the calling rate on calling from the called side to the calling side. In this case, since the control unit 15 includes the control unit 15 for re-calling from the called side, the following operations and effects are achieved.

In the above configuration, the control unit 15 of the wireless communication terminal device receives the call charge information on the call from the wireless communication network and activates the call, and notifies the call charge information as a call setting parameter. Upon receiving the call charge information from the partner terminal notified as the call setting parameter, the called-side wireless communication terminal device compares the call charge to the previously stored partner terminal and makes a call again. If the call charge becomes cheaper, the incoming call is disconnected and the call is re-transmitted to the wireless communication terminal device that has just received the incoming call.

That is, in the first embodiment of the present invention, when a call is made from the first wireless terminal to the second wireless terminal, a call charge for the call and the second wireless terminal transmits the call to the first wireless terminal. Call rate when the call is made to the user, and when the latter is cheaper, the call rate can be reduced by providing a callback system for automatically re-calling from the second wireless terminal. It is possible to bring about an effect.

[2] Second Embodiment In the above-described first embodiment of the present invention, the transmitting terminal is a wireless communication terminal device, but the transmitting terminal is a normal wired terminal. The embodiment of the present invention is also easily possible, and the embodiment in which the call charge information stored in the terminal is information relating to the call in addition to the country information, the call charge information, the currency rate, and the like is also easily possible.

Further, in the first embodiment of the present invention, the information relating to the call charge is stored in the terminal. The second embodiment for performing the processing can be easily realized.

Further, in the above-described first embodiment of the present invention, the call charge information on the calling side is notified to the receiving terminal as a parameter for call setting. However, the second embodiment according to another notification method. Can also be easily realized.

In the above-described second embodiment of the present invention, similarly to the above-described first embodiment, when a call is made from the first wireless terminal to the second wireless terminal, the call associated with the call is made. A call-back method is provided in which the charge is compared with a call charge required when a call is made from the second wireless terminal to the first wireless terminal, and if the latter is cheaper, the call is automatically sent from the second wireless terminal. As a result, it is possible to bring about an excellent effect that a call charge can be saved.

[3] Third Embodiment In the above-described first embodiment of the present invention, an example has been described in which it is determined whether or not to always call back an incoming call. The third embodiment in which the mode is set to be performed can be easily realized.

Further, a caller number for determining whether or not to make a callback is stored in the terminal, and it is determined whether or not to call back only when there is an incoming call from the stored caller number. Can also be easily realized.

In the above-described third embodiment of the present invention, similarly to the first embodiment, when a call is made from the first wireless terminal to the second wireless terminal, the call related to the call is made. A call-back method is provided in which the charge is compared with a call charge required when a call is made from the second wireless terminal to the first wireless terminal, and if the latter is cheaper, the call is automatically sent from the second wireless terminal. As a result, it is possible to bring about an excellent effect that a call charge can be saved.

[Other Embodiments] In the first embodiment of the present invention, an example of a wideband CDMA mobile communication system which is a candidate for an IMT2000 system which is a radio communication system considering roaming has been described. But a narrowband CD assuming other similar roaming connections
It is also applicable to MA mobile communication systems and the like.

In another embodiment of the present invention as described above, similarly to the first embodiment, a call charge for a call when a call is made from the first wireless terminal to the second wireless terminal. Providing a callback method for comparing a call charge when a call is made from the second wireless terminal to the first wireless terminal, and automatically calling the second wireless terminal if the latter is cheaper. Accordingly, it is possible to bring about an excellent effect that a call charge can be saved.

The present invention may be applied to a system constituted by a plurality of devices or to an apparatus constituted by a single device. A storage medium storing software program codes for realizing the functions of the above-described embodiments is supplied to a system or an apparatus, and a computer (or CPU or MPU) of the system or the apparatus executes the program code stored in the storage medium. Needless to say, this can also be achieved by executing the reading.

In this case, the program code itself read from the storage medium implements the functions of the above-described embodiment, and the storage medium storing the program code constitutes the present invention.

As a storage medium for supplying the program code, for example, a floppy disk, hard disk, optical disk, magneto-optical disk, CD-ROM, CD
-R, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.

When the computer executes the readout program code, not only the functions of the above-described embodiment are realized, but also the OS and the like running on the computer are actually executed based on the instructions of the program code. It goes without saying that a part or all of the above-described processing is performed, and the functions of the above-described embodiments are realized by the processing.

Further, after the program code read from the storage medium is written into a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer, based on the instruction of the program code, It goes without saying that the CPU included in the function expansion board or the function expansion unit performs part or all of the actual processing, and the processing realizes the functions of the above-described embodiments.

[0063]

As described above, claims 1 to 12 are provided.
According to the callback device described above, when a call is made from the calling side (first wireless terminal) to the called side (second wireless terminal), the call charge for the call and the called side (second wireless terminal) Terminal)
From the caller (first wireless terminal) to the caller, and if the latter is cheaper, the caller (second wireless terminal)
By providing a callback system for automatically re-transmitting a call from a wireless terminal), an excellent effect of reducing call charges can be achieved.

According to the callback method of the present invention, by executing the callback method by the callback device, the calling side (the first wireless terminal) can receive the call (the second wireless terminal). The call charge for the call when the call is sent to the wireless terminal) is compared with the call charge for the call from the callee (the second wireless terminal) to the caller (the first wireless terminal). By providing a callback system for automatically re-calling from the called side (second wireless terminal) when it is cheaper, it is possible to bring about an excellent effect that call charges can be saved. .

According to the storage medium of the twenty-fifth aspect, the callback method is read from the storage medium and executed by the callback device, so that the calling side (the first wireless terminal) can call the called side (the first wireless terminal). And comparing the call charge for the call when the call is made to the caller (the second wireless terminal) with the call charge for calling the caller (the first wireless terminal) from the called side (the second wireless terminal), If the latter is cheaper, it is possible to provide an excellent effect that a call charge can be saved by providing a callback system for automatically re-calling from the called side (second wireless terminal). Becomes

[Brief description of the drawings]

FIG. 1 shows W-CDMA according to a first embodiment of the present invention.
FIG. 2 is a functional block diagram illustrating a configuration of a wireless communication terminal device of the mobile communication system.

FIG. 2 shows W-CDMA according to the first embodiment of the present invention.
FIG. 2 is a conceptual diagram illustrating roaming of a mobile communication system.

FIG. 3 is a diagram illustrating W-CDMA according to the first embodiment of the present invention.
FIG. 3 is an explanatory diagram showing a location registration sequence of the mobile communication system.

FIG. 4 is W-CDMA according to the first embodiment of the present invention.
FIG. 3 is an explanatory diagram showing call charge information stored in a wireless communication terminal device of a mobile communication system.

FIG. 5 is W-CDMA according to the first embodiment of the present invention.
5 is a flowchart illustrating control of a wireless communication terminal device of the mobile communication system.

FIG. 6 shows W-CDMA according to the first embodiment of the present invention.
FIG. 3 is an explanatory diagram showing a sequence at the time of transmission of a mobile communication system.

FIG. 7 shows W-CDMA according to the first embodiment of the present invention.
FIG. 4 is an explanatory diagram showing a sequence at the time of incoming of a mobile communication system.

FIG. 8 is an explanatory diagram showing a normal transmission sequence.

FIG. 9 is an explanatory diagram showing a normal incoming call sequence.

[Explanation of symbols]

 Reference Signs List 15 control unit 16 setting information storage unit 200 communication network 201 service zone of carrier A 202 wireless channel control device of carrier A 203 wireless terminal A 211 service zone of carrier B 212 wireless channel control of carrier B apparatus

Continued on front page F-term (reference)

Claims (25)

[Claims] Claims: 1. A callback device for making a call at a low call charge, comprising: comparing a call charge applied to a calling party when receiving a call with a call charge applied when a call is made from the called party to the calling party; A call-back device comprising communication control means for re-calling from the called side when the latter call rate is low. 2. A wireless communication system comprising: a plurality of wireless base stations connected to a wireless network controller via a wired communication network;
Applicable to a wireless communication system that provides a communication service by making a wireless connection with a roaming-capable wireless terminal that performs a wireless connection and communicates even in a service zone controlled by a system other than the registered system. The callback device according to claim 1, wherein 3. A storage means for storing information relating to a call charge, wherein the communication control means receives the information relating to the call charge from a communication network when registering a location in the service zone, and stores the information in the storage means. 3. The callback device according to claim 1, wherein: 4. The callback apparatus according to claim 3, wherein said communication control means stores country information, call charge information, and currency rate in said storage means as information relating to said call charge. 5. The callback device according to claim 1, wherein the calling side is a wireless terminal. 6. The callback device according to claim 1, wherein the calling side is a wired terminal. 7. The communication control means according to claim 1, wherein said communication control means is capable of accessing a call charge database on a communication network in which information relating to said call charge is stored when making or receiving a call. The callback device according to any one of 2, 5, and 6. 8. The callback device according to claim 1, wherein said communication control means determines whether or not to always call back the incoming call. 9. The call according to claim 1, wherein a mode can be set as to whether the communication control means determines whether or not to call back the incoming call. Back device. 10. The communication control means stores caller information for determining whether or not to call back for an incoming call, and calls back the caller in the case of an incoming call corresponding to the caller information. The callback device according to any one of claims 1 to 7, wherein it is possible to determine whether or not to do so. 11. The method according to claim 1, wherein the method is applicable to a wideband code division multiple access mobile communication system.
0. The callback device according to any one of 0. 12. The method according to claim 1, wherein the method is applicable to a narrowband code division multiple access mobile communication system.
0. The callback device according to any one of 0. 13. A call-back method applied to a call-back method for making a call at a low call charge, wherein the call charge is applied to a calling party at the time of an incoming call and is applied when a call is made from the called party to the calling party. A call back method comprising a communication control step of comparing a call charge and, when the latter call charge is low, calling back from the called side. 14. A system other than a system which exists in a service zone formed by a plurality of radio cells each having a plurality of radio base stations connected to a radio network controller via a wired communication network and which is registered. 14. A wireless communication system that provides a communication service by performing a wireless connection with a roaming-capable wireless terminal that performs a wireless connection even within a service zone controlled by the system of claim 13. The described callback method. 15. The callback method according to claim 13, wherein, in the communication control step, information regarding a call charge is received from a communication network and stored in a storage unit when the location is registered in the service zone. 16. The callback method according to claim 15, wherein in the communication control step, country information, call rate information, and currency rate are stored in the storage unit as information on the call rate. 17. The method according to claim 13, wherein the calling side is a wireless terminal. 18. The callback method according to claim 13, wherein the calling side is a wired terminal. 19. The communication control step, wherein a call charge database on a communication network in which information on the call charge is stored can be accessed when making or receiving a call. 19. The callback method according to any one of 14, 17, and 18. 20. The callback method according to claim 13, wherein in the communication control step, it is determined whether or not to always call back an incoming call. 21. The call according to claim 13, wherein a mode can be set to determine whether or not to make a callback for an incoming call in the communication control step. Back method. 22. In the communication control step, caller information for determining whether or not to call back to an incoming call is stored, and a call back is made in the case of an incoming call corresponding to the caller information. 20. The callback method according to claim 13, wherein it is possible to determine whether or not to do so. 23. The callback method according to claim 13, which is applicable to a wideband code division multiple access mobile communication system. 24. The callback method according to claim 13, which is applicable to a narrowband code division multiple access mobile communication system. 25. A storage medium readable by a computer storing a program for executing a callback method applied to a callback apparatus for making a telephone call at a low rate, wherein the callback method originates a call when receiving a call. A communication control step of comparing the charge applied to the caller with the charge applied when calling from the callee to the caller, and if the latter charge is lower, recalling from the callee. Medium.