JPH08307949A - Portable communication terminal machine and its communication re-connecting system - Google Patents

Abstract

PURPOSE: To continue a call again as if communication is not cut by executing a re-calling operation in short time even if communication is cut, automatically making a response again without executing a response operation and re- connecting communication. CONSTITUTION: When a discrimination means 19 discriminates that communication is cut by permitting the user of a portable communication terminal on either a calling-side or an incoming call-side to execute the cut operation of communication, the call is terminated as it is. When the discrimination means 19 discriminates that communication is cut without executing the cut operation, a call control means 20 controls a call means, and the portable communication terminal machine on the calling-side executes the re-calling operation to the portable communication terminal machine of the incoming call-side without accompanying incoming call sound. Thus, the portable communication terminal machine on the incoming call-side, which is re-called, automatically executes a re-response operation so as to re-connect communication even if the response operation by the user is not executed since a response means is controlled by a response control means 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication terminal which can be used not only as an ordinary mobile phone but also as a transceiver, and a communication reconnection system therefor.

[0002]

2. Description of the Related Art For example, in a simple mobile phone system such as a PHS (Personal Handyphone System), a cordless phone used indoors, such as in a company or at home, is used as a mobile device for a cordless phone as an outdoor device. It can also be used for telephone calls. That is, the PHS handset is capable of making a call with the other party's telephone via the base station, and makes a call by wirelessly calling to a company, home, or another handset as another mobile telephone from the outside. You can do it.

Such PHS handsets can be operated by switching the mode button not only in a place (service area) near the base station but also in a service area where the radio wave does not reach because the base station is too far away. It can also be used for direct calls as a transceiver between handset units.

When the transceiver is used between the slaves as described above, there is no need to press and talk with each other (press talk) unlike the conventional transceiver, and just hold it like a handset of a normal telephone. You can make calls (even if you don't have a handset by using an earphone microphone). In addition, the PHS handset is free of charge when used as a transceiver, and can be given a telephone number independently of the base unit.

Further, when the PHS slaves are used as transceivers, it is used for other commercial purposes because the call charge is free if the call can be made without a time limit. Therefore, one standard call must be completed in 3 minutes, and then a pause of 2 seconds or more must be provided in the standard.

[0006] Furthermore, if the two slaves are used as transceivers for a long time, when a call is received from a third party via the base station, a function such as a call waiting function is provided to notify the call. Apart from the case where it has, there is also the inconvenience that it is not possible to connect a telephone call wirelessly forever, so it seems that the above is defined by the standard.

Next, a concrete operation that can be considered as a transceiver operation between the slaves when such slaves are used as transceivers will be described in detail based on a flow chart and a time chart. First, regarding the transceiver operation of the calling side cordless handset 1,
This will be described with reference to FIGS. 8 and 10.

First, with respect to the slave unit 1 in the standby state in step S1, a call instruction operation for calling the other party is performed by key operation (step S2). Then, the cordless handset 1 performs a calling operation (step S3), and starts a 3-minute timer (step S4). Then, the handset 1 waits for a response (step S5), and when the user of the called side handset 1 of the other party performs a response operation, a response display is displayed on the calling side handset 1 (step S6). Then, a call is made (step S7).

In step S7, when the call is in progress, 3
When minutes have passed (time-out, TO) (step S
8) Then, the communication is automatically disconnected according to the standard (step S9), and the calling handset 1 returns to the original standby state (step S10).

When the conversation ends before the lapse of 3 minutes during the call in step S7 and the user on the calling side operates the disconnection instruction of the handset 1 (step S11), the 3-minute timer stops. (Step S12), the communication is disconnected (step S13), and the calling side child device 1 returns to the original standby state (step S14).

When the user of the called-side cordless handset 1 issues a disconnection instruction to disconnect the communication during the call in step S7, a disconnection indication is displayed on the calling-side cordless handset 1 (step S1).
5). At this time, the 3-minute timer is also stopped (step S16), and the calling side child device 1 returns to the original standby state (step S17).

By the way, in the handset 1 waiting for a response in step S5, when the user on the calling side operates a disconnection instruction for the handset 1 before the handset 1 on the called side responds (step S18). ) The 3-minute timer stops (step S19), the communication is disconnected (step S20), and the calling handset 1 returns to the original standby state (step S19).
21).

In step S5, if the connection with the called handset 1 fails (step S22), the three-minute timer stops (step S23), and the calling handset 1 is stopped.
Returns to the original standby state (step S24).

Next, the operation of the transceiver of the called station 1 will be described with reference to FIGS. 9 and 10. When the call from the caller-side cordless handset 1 is received from the caller-side cordless handset 1 in the standby state of step S1 and the call-indication is displayed (step S2), the caller-side cordless handset 1 A ring tone is transmitted from the machine 1 (step S3), and a 3-minute timer is started (step S4).

As described above, when the user on the called side performs a response instruction operation on the called side child device 1 in the response waiting state (step S5) (step S6), communication is connected (step S6). In step S7, the call is started (step S).
8). When 3 minutes have passed after talking (step S
9) Then, the call is automatically disconnected according to the standard (step S10), and the called-side cordless handset 1 returns to the original standby state (step S11).

During the call in step S8, if the user on the called side performs a disconnection instruction operation for the handset 1 before 3 minutes have passed since the end of the call (step S12), 3
The minute timer stops (step S13), the communication is disconnected (step S14), and the called-side cordless handset 1 returns to the original standby state (step S15).

During the call in step S8, when the user on the calling side issues a disconnection instruction to the cordless handset 1 and the communication is disconnected, a disconnection display is displayed on the cordless handset 1 (step S16). . At this time, the 3-minute timer is also stopped (step S17), and the called-side cordless handset 1 returns to the original standby state (step S18).

Further, when the user on the calling side issues a disconnection instruction to the cordless handset to disconnect the communication before the response instruction is given (step S6) from the response waiting in step S5, the cordless handset 1 on the called side is instructed. The disconnection display is performed (step S19). At this time, stop the 3-minute timer (step S20),
The called-side cordless handset 1 returns to the original standby state (step S21).

[0019]

However, for a user who uses the transceiver function between the slaves as described above, it takes 3 minutes even if the caller does not cut the call during the call. And the call will be automatically disconnected, so you will be surprised or uncomfortable.
Further, when it is absolutely necessary to continue the call, as shown in FIG. 10, dial operation (calling operation) is performed from the beginning.
It is necessary to re-communicate and reconnect, and after 3 minutes have passed, the call is automatically disconnected again and communication must be re-established, which is a problem that the operability is very poor. .

Therefore, according to the present invention, when the communication is disconnected without performing the disconnection operation, the mobile communication terminal automatically re-calls and continues the call as if the communication was not disconnected. It is an object of the present invention to provide a portable communication terminal and a communication reconnection system for the same.

[0021]

In order to solve the above problems, the mobile communication terminal according to the present invention has the following configuration.

(1) As means for use as a calling side, calling means for making a calling operation to the called side, storage means for storing the called party's telephone number, and disconnection by the user A determination unit that determines whether the communication is disconnected without performing an operation, and a telephone stored in the storage unit when the determination unit determines that the communication is disconnected without performing the disconnection operation. And a call control means for controlling the call means so that the callee side of the number can make a call again without a ring tone.

(2) As means for use as a called side, a response means for responding to an incoming call from the calling side, a storage means for storing a telephone number of the calling side, and a user's A discriminating means for discriminating whether or not the communication is disconnected without performing the disconnecting operation, and a discriminating means for discriminating whether or not the telephone number of the calling side which is called after the disconnection is the same as the telephone number stored in the storage means before the disconnection. The second discriminating means and the discriminating means discriminate that the communication has been disconnected without performing the disconnecting operation, and the telephone number of the calling side called by the second discriminating means is stored in the storage means. When it is determined that the telephone number is the same as the telephone number, the response control means for controlling the response means is provided so as to automatically make a response again even if the response operation by the user is not performed.

(3) As means used when used as a calling side, calling means for making a calling operation to the called side, storage means for storing the telephone number of the called side, and disconnection by the user A determination unit that determines whether the communication is disconnected without performing an operation, and a telephone stored in the storage unit when the determination unit determines that the communication is disconnected without performing the disconnection operation. A call-in control unit that controls the call-out means so that the call-in side of the number can make a re-call without ringing tone, and is used as a call-in side as a call-in side. A response means for responding to the call, a storage means for storing the telephone number of the calling side, a determination means for determining whether the communication is disconnected without the disconnection operation by the user, and an incoming call after the disconnection. Before the calling party's telephone number is disconnected Second discriminating means for discriminating whether the telephone number is the same as the telephone number stored in the storing means, the discriminating means discriminating that the communication has been disconnected without performing the disconnecting operation, and the second discriminating means determines whether the communication is terminated. When it is determined that the calling telephone number of the calling side is the same as the telephone number stored in the storage means, the response means is set to automatically re-respond even if the response operation by the user is not performed. And a response control means for controlling.

[0025]

According to the mobile communication terminal having such a configuration, the communication is disconnected when the user of the mobile communication terminal on either the calling side or the called side performs the communication disconnection operation by the determination means. When it is determined that the call is terminated, the call is terminated by the determining means, and when the communication is disconnected without the disconnecting operation being performed by the determining means, the call controlling means controls the calling means to control the calling side. The mobile communication terminal makes a re-call operation without a ring tone to the mobile communication terminal of the called side, and the response control means controls the response means of the called mobile communication terminal of the called side. Even if the response operation by the user is not performed, the re-response operation is automatically performed to reconnect the communication.

Therefore, when the communication is disconnected without the disconnection operation of the user, the recalling operation is performed without a ringing tone within a short time even if the communication is actually disconnected,
Since it is automatically re-answered and the communication is reconnected without performing a response operation, it becomes possible to continue the call again as if the communication was not disconnected, a little "Is it a bit strange" By giving it, it can prevent the user from being surprised or uncomfortable, and since it is not necessary to redo the dial operation from the beginning, it is possible to continue the call as much as necessary without worrying about time. Therefore, the operability can be significantly improved.

By the way, conventionally, Japanese Patent Laid-Open No. 5-276101
Japanese Patent Laid-Open No. 5-276111 and Japanese Patent Laid-Open No. 5-3276.
Each of the gazettes related to No. 07 describes a wireless telephone device having a function of automatically performing a recalling process when a line is disconnected during a call without an end call operation. It is the same as the conventional one in that the communication is not reconnected unless the key ring for answering is performed by ringing the tone as well as making the call. On the other hand, according to the present invention, when a call is re-issued, the call is made without sounding the ringing tone, and the called side does not need to operate a key for answering and the call is automatically answered. Is different from the wireless telephone device according to the above publication in that it can be used as if it had been continued.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 are views illustrating an embodiment of a mobile communication terminal and a communication reconnection system according to the present invention.

In FIG. 1, reference numeral 30 is a PHS parent machine, and reference numeral 1 is its child machine. The PHS parent device 30 and the child device 1 communicate with each other wirelessly (cordlessly) indoors, and the user of the child device 1 talks with the user of the distant telephone of the other party via the parent device 30. can do.

Such a PHS slave unit 1 can also be used as a mobile communication terminal. That is, as shown in FIG. 2, the handset 1 wirelessly communicates with the nearest base station 2a outdoors, and the base station 2a is connected to another base station 2b via a management center 4 connected by wire. Other mobile phone 1b (destination) by radio from base station 2b
Can be called. Alternatively, the base station 2a is connected via a management center 4 to an indoor telephone 5 (destination) connected by wire, and the cordless handset 1 can also talk with the indoor telephone 5.

As shown in FIG. 3, the PHS cordless handset 1 is
It is possible to directly communicate with the other handset 1c of the PHS wirelessly like a transceiver outdoors. The use of such a PHS as a transceiver between handset units is possible not only inside the service area but also during the service area as well as outside the service area. That is, it is possible to directly talk between the handset units without going through the base station.

As shown in FIG. 4, the PHS slave unit 1 includes an operation unit 8 having a keyboard and the like, a display unit 10 having a liquid crystal display screen and the like, a speaker 16, an audio signal processing unit 15 connected to a microphone 17, and various types. ROM or RAM that stores information
A storage unit 18 configured by, for example, a determination unit 19 that determines whether the communication is disconnected without the user performing a disconnection operation, and a telephone number stored in the storage unit 18 based on a signal from the determination unit 19. The calling control means 20 for controlling the wireless transmission / reception section 23 so that the called side of the caller can re-call without ringing tone, and the telephone number of the calling side called after the disconnection is stored in the storage means 18 before the disconnection. Based on the signals from both the second discriminating means 22, the discriminating means 19 and the second discriminating means 22 for discriminating whether or not the telephone number is the same as the telephone number, a re-incoming call is made from the calling side of the telephone number stored in the storing means If there is, a response control means 21 for controlling the wireless transceiver 23 so as to automatically re-respond even if the user does not perform a response operation, and a wireless transceiver for transmitting and receiving wireless communication with the base station. Equipped with 23, In addition, a central part for controlling the operation unit 8, the display unit 10, the audio signal processing unit 15, the storage unit 18, the determination unit 19, the call control unit 20, the response control unit 21, the second determination unit 22, and the wireless transmission / reception unit 23. The controller 25 is provided.

The storage means 18 stores the telephone number of the other party's terminal during the call. Therefore, when the cordless handset 1 is used as the calling side, the storage unit 18 stores the telephone number of the called terminal, and when the cordless handset 1 is used as the called side, the memory unit 18 is stored. The telephone number of the calling terminal is stored in the.

The operation unit 8 has a normal mode in which it can communicate with the other party's mobile phone 1b or the indoor phone 5 via the base stations 2a and 2b and the management center 4, when it is used as a normal mobile phone, and the base station, etc. Handset 1, 1c without going through
There is provided an operation button (or key) that can be selected and switched between the transceiver mode in the case where the two can talk directly with each other.

The calling control means 20 operates only when the slave unit 1 is used as a calling side, and the second discrimination means 22.
The response control means 21 operates only when the handset 1 is used as a called side. The wireless transmission / reception unit 23 has a function as a calling means when the handset 1 is used as a calling side and a function as a response means when the handset 1 is used as a called side.

Next, the operation when the PHS handset 1 according to the above embodiment is used as a transceiver will be described in detail with reference to a flow chart and a time chart.

First, the transceiver operation of the calling side slave unit 1 will be described with reference to FIGS. Steps S1 to S3 are the same as the operation in FIG. 8 described above, but in the slave unit 1 according to the above embodiment, step S3
Then, the telephone number of the callee (callee) handset 1 is stored in the storage means 18 (step S4), and then the 3-minute timer is started (step S5). In this way, after the slave unit 1 waits for a response (step S6), the called side slave unit 1 responds and a response display is displayed on the calling side slave unit 1 (step S7), and the call starts. (Step S
8).

During the call in step S8, the discriminating means 19 does not perform the disconnecting operation by the user on the calling side or the called side, and 3 minutes according to the standard time out (TO).
If it is determined that the connection has been cut due to the
9) When the communication is disconnected (step S10), the 2-second timer is started (step S11), and the caller-side cordless handset 1 is in a state of waiting for a re-call (step S12).

After that, when 2 seconds according to the standard are timed out (step S13), a calling operation without a ring tone to the other party of the telephone number stored in the storage means 18, that is, the other party who was talking immediately before being disconnected. (Step S14), the 3-minute timer starts (step S1
5) The calling side child device 1 enters a state of waiting for a re-response (step S16).

When the called remote unit 1 of the other party responds, a response is displayed on the calling remote unit 1 (step S17), and the call is started (step S18). After that, the calling handset 1 returns to before step S8 and repeats the above operation.

In the case where the handset 1 in the waiting state for re-response in step S16 is operated by the user to instruct disconnection of the calling handset 1 before the other handset 1 responds ( (Step S19) The three-minute timer is stopped (step S20), communication is disconnected (step S21), and the calling handset 1 returns to the original standby state (step S22).

In the handset 1 waiting for re-response in step S16, if the calling handset 1 fails to connect to the called handset 1 (step S23), a three-minute timer Stops (step S24), and the cordless handset 1
Returns to the original standby state (step S25).

In addition, in the case where the cordless handset 1 in the waiting state for re-calling in step S12 performs the disconnection instruction operation by the calling user before 2 seconds elapse (step S2).
6) The 2-second timer stops (step S27)
When the communication is disconnected (step S28), the calling side child device 1 returns to the original standby state (step S29).

When the user of the calling side cordless handset 1 operates the cording instruction for the cordless handset 1 after the call in step S8 is finished (step S30), the three-minute timer is stopped (step S31). The communication is disconnected (step S28), and the calling handset 1 returns to the original standby state (step S29).

If the user on the called side gives a disconnection instruction and the communication is disconnected before the lapse of 3 minutes during the call in step S8, a disconnection display is displayed on the cordless handset 1 ( Step S34). At this time, the 3-minute timer is also stopped (step S35), and the calling handset 1 returns to the original standby state (step S36).

If the user on the calling side issues a disconnection instruction before the called side answers after the state of waiting for a response at step S6 (step S37), the three-minute timer is stopped (step S38). Is disconnected (step S39), and the calling handset 1 returns to the original standby state (step S40).

Further, if the connection with the called side fails after waiting for the response in step S6 (step S41), 3
The minute timer is stopped (step S42), and the calling handset 1 returns to the original standby state (step S43).

Next, the transceiver operation of the called station 1 according to the above embodiment will be described with reference to FIGS. 6 and 7. The operation from step S1 to step S4 is the same as the operation in FIG. 9 described above, but after step S4, the telephone number of the calling handset 1 is stored in the storage means 18 (step S5), and then The handset 1 waits for a response (step S6).

When the user performs a response instruction operation on the called-side cordless handset 1 (step S7), communication is connected (step S8) and a call is started (step S).
9).

If it is determined in step S9 that the caller or callee is disconnected because the caller-side or call-inside user does not perform disconnection operation, the caller or callee is disconnected (step S10). ), The communication is disconnected (step S11), the 10-second timer is started (step S12), and the called-side cordless handset 1 is in a state of waiting for re-calling (step S13). In this way, by adopting the 10-second timer on the called side as opposed to the 2-second timer on the calling side, it is possible to prevent the deviation of the timer measurement and to ensure that the called side can make a call from the calling side. You can call in.

When the incoming call is made, the incoming call is displayed on the incoming call side slave unit 1 (step S14). In this case, however, the ring tone is not sent to the incoming call side subunit 1. ing.
Then, the 10-second timer is stopped (step S15), and the 3-minute timer is started (step S16). Next, it is judged whether or not the calling side who has called is the same as the telephone number of the calling side whose call was disconnected immediately before (step S17).

When it is determined that the other party has the same telephone number (the same), communication is automatically connected (step S
18) The call is started again (step S19). In this case, even if the user of the called-side cordless handset 1 does not perform the response instruction operation in step S7, the called-side cordless handset 1 automatically performs the response connection operation.

In this way, by automatically re-responding to a re-incoming call with no ring tone, the user can talk continuously without being aware of the disconnection of the call. You can get the feeling of being present. After step S19, the procedure returns to step S9 and the above-described operation is repeated.

By the way, in step S17, if the called telephone number of the called side is different (different) from the called party in step S9, the process returns to the step before step S5 and the above operation is repeated.

In step S13, if 10 seconds have timed out without the incoming call from the calling side again (step S20), the incoming call side cordless handset 1 returns to the original standby state (step S21). .

In step S13, if the user on the called side performs a disconnection instruction operation before 10 seconds have elapsed (step S22), the 10-second timer is stopped (step S23), and communication is started. Disconnected (step S2
4) The called-side cordless handset 1 returns to the original standby state (step S25).

In step S9, when the user on the called side performs an operation of disconnection instruction (step S2)
6) The 3-minute timer stops (step S27)
The communication is disconnected (step S28), and the called-side cordless handset 1 returns to the original standby state (step S29).

In step S9, when communication is cut off by the user on the calling side giving a disconnection instruction before the lapse of 3 minutes, a disconnection display is displayed on the called-side cordless handset 1 (step S9). S30). At this time, the 3-minute timer is also stopped (step S31), and the child device 1 returns to the original standby state (step S32).

Further, in the state of waiting for a response in step S6, if the calling user gives a disconnection instruction before the called user gives a response instruction, the communication is cut off.
A disconnection display is displayed on the called-side cordless handset 1 (step S3).
3). At this time, the 3-minute timer is also stopped (step S
34), the cordless handset 1 returns to the original standby state (step S35).

In the above embodiment, the case of using the PHS cordless handset as the mobile communication terminal has been described, but the present invention can be applied to a mobile telephone other than the PHS cordless handset.

Further, in the above embodiment, the means used by the portable communication terminal for both the automatic recalling function and the automatic re-answering function (storage means 18, discriminating means 19, call control means 20,
Although the case where the second discrimination means 22, the response control means 21, and the wireless transmission / reception section 23) are provided has been described, the means (storage means 18, determination means 19, call control means 20, and wireless transmission / reception section) used only for the automatic recall function. 23) or means used only for the automatic re-reply function (storage means 18, discrimination means 1)
9, the second determination unit 22, the response control unit 21, and the wireless transmission / reception unit 23) may be included. By reducing the functions and parts in this way, it is possible to reduce the size and cost of the mobile communication terminal.

In the above embodiment, the automatic reconnection function always operates when the transceiver mode is selected. However, even when the transceiver mode is selected, the case where the automatic reconnection function is not operated can be selected. Good.

In addition to the case where the communication is disconnected due to some reason without the disconnection operation other than the case where the communication is disconnected due to the 3-minute timeout, the communication terminal is automatically reconnected. Good.

Further, in the above embodiment, the case where the mobile communication terminal is used as a transceiver has been described. However, even when the mobile communication terminal is used as a mobile phone and a call is made through the base station, some kind of communication is required. The present invention can be applied when the communication is disconnected for the reason that the disconnection operation is not performed.

[0065]

As described above, according to the present invention, when the communication is disconnected without the disconnection operation of the user, even if the communication is actually disconnected, the ring tone is received within a short time. The call is recalled without being accompanied, and the call is automatically re-answered and the communication is re-connected without performing a response operation, so it is possible to continue the call as if the communication was not disconnected, It can prevent users from being surprised or uncomfortable, and since it is not necessary to redo the dial operation from the beginning, it is possible to continue talking as long as you need without worrying about time. Can be significantly improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a parent device 30 of a PHS and a child device 1 according to an embodiment of a mobile communication terminal according to the present invention.

FIG. 2 is a schematic configuration diagram of an entire communication system in which a PHS slave unit 1 is used as a mobile communication terminal.

FIG. 3 is a diagram showing a case where handset units of PHS are used as a transceiver in a call.

FIG. 4 is a block circuit diagram showing a configuration of a child device 1 as a mobile communication terminal.

FIG. 5 is a flowchart showing a transceiver operation of a calling side child device 1 as a mobile communication terminal according to an embodiment of the present invention.

FIG. 6 is a flowchart showing a transceiver operation of a called-side cordless handset 1 as a mobile communication terminal according to an embodiment of the present invention.

FIG. 7 is a time chart showing a communication operation procedure between a calling side handset and a called side handset as a mobile communication terminal according to an embodiment of the present invention.

FIG. 8 is a flowchart showing a transceiver operation of a calling handset that is considered when the present invention is not used.

FIG. 9 is a flowchart showing a transceiver operation of a called-side handset that can be considered when the present invention is not used.

FIG. 10 is a time chart showing a communication operation procedure between a calling side handset and a called side handset which can be considered when the present invention is not used.

[Explanation of symbols]

 1, 1b, 1c PHS cordless handset 2a, 2b Base station 4 Management center 5 Indoor telephone 8 Operation part 10 Display part 15 Voice signal processing part 16 Speaker 17 Microphone 18 Storage means 19 Discrimination means 20 Call control means 21 Response control means 22 second discriminating means 23 wireless transmitter / receiver 25 central controller 30 base unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hironori Matsumoto 2-1-1 Kagahara, Tsuzuki-ku, Yokohama-shi, Kanagawa Kyocera Corporation Yokohama Works (72) Inventor Shoichi Morokuma 2 Kagahara, Tsuzuki-ku, Yokohama-shi, Kanagawa -1-1 Inside Kyocera Corporation's Yokohama Office (72) Inventor Yoshitaka Ueki 2-1-1 Kagahara, Tsuzuki-ku, Yokohama-shi, Kanagawa Inside Kyocera Corporation's Yokohama Office

Claims (5)

[Claims] 1. As a means to be used as a calling side, a calling means for making a call to the called side, a storage means for storing a telephone number of the called side, and a disconnecting operation by a user. When the determination unit determines that the communication is disconnected without performing the disconnection operation, and the determination unit determines whether the communication is disconnected without performing the disconnection operation, the telephone number stored in the storage unit 2. A mobile communication terminal, comprising: a call control means for controlling the call means so that the called side can make a re-call without a ring tone. 2. As means for use as a called side, a response means for responding to an incoming call from the calling side, a storage means for storing a telephone number of the calling side, and a disconnection by a user A determining means for determining whether the communication is disconnected without performing an operation, and a determining means for determining whether the telephone number of the calling side which is called after the disconnection is the same as the telephone number stored in the storage means before the disconnection 2 discrimination means, and the discrimination means discriminates that communication has been disconnected without performing the disconnection operation, and the telephone number of the calling side called by the second discrimination means is stored in the storage means. When it is determined that it is the same as the telephone number, a response control means for controlling the response means to automatically re-respond even if the response operation by the user is not carried out, Communication terminal. 3. As means for use as a calling side, a calling means for making a calling operation to the called side, a storage means for storing a telephone number of the called side, and a disconnecting operation by a user. When the determination unit determines that the communication is disconnected without performing the disconnection operation, and the determination unit determines whether the communication is disconnected without performing the disconnection operation, the telephone number stored in the storage unit And a call control means for controlling the calling means so that the called side can make a re-call without ringing tone. A response means for responding, a storage means for storing the telephone number of the calling side, a determination means for determining whether or not the communication is disconnected without the disconnection operation by the user, and a call origination after the disconnection. Before the caller's phone number disconnects Second discriminating means for discriminating whether the telephone number is the same as the telephone number stored in the storing means, the discriminating means discriminating that the communication has been disconnected without performing the disconnecting operation, and the second discriminating means determines whether the communication is terminated. When it is determined that the calling telephone number of the calling side is the same as the telephone number stored in the storage means, the response means is set to automatically re-respond even if the response operation by the user is not performed. A mobile communication terminal, comprising: a response control unit for controlling. 4. The mobile communication terminal according to claim 1, wherein the terminals directly communicate with each other by radio without using a base station. 5. When the communication is disconnected by the user of the communication terminal on either the calling side or the called side disconnecting the communication, the call is terminated and the disconnecting operation is performed. If the communication is disconnected without a call, the communication terminal of the calling side performs a recall operation without a ring tone to the communication terminal of the called side, and the called communication terminal of the called side is called. Is a communication reconnection system for portable communication terminals, which automatically re-answers and reconnects communication even if the user does not perform a response operation.