JP2864358B2 - Portable communication terminal and communication reconnection system thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable communication terminal that can be used as a normal portable telephone and also as a transceiver, and a communication reconnection system therefor.

[0002]

2. Description of the Related Art For example, in a simple portable telephone system such as a PHS (Personal Handy Phone System), a cordless telephone used as an indoor unit such as a company or home is used as a portable unit as an outdoor unit as a portable telephone. Can also be used for telephone calls. That is, the handset of the PHS can talk with the telephone of the other party via the base station, and can call the office, home, or another handset as another mobile phone by radio from outside. You can do it.

[0003] Such a handset of PHS is provided with a plurality of modes by switching a mode button in a place (service area) where the base station is close and also in a service area where the base station is too far away and radio waves cannot reach. It can also be used for direct calls as transceivers between handset units.

As described above, when using as a transceiver between handset units, it is not necessary to talk while pressing a button (press talk) as in a conventional transceiver. You can make calls (without using a handset if you use an earphone microphone). The PHS handset is free of charge when used as a transceiver, and can be given a telephone number independently of the base unit.

[0005] When the PHS slaves are used as transceivers, it is possible to make a call without any time limit. If the PHS slaves are used for other commercial purposes, the call charges are free. Since there is a possibility that one call can be completed in three minutes, it is specified in the standard that a pause time of two seconds or more must be provided thereafter.

[0006] Further, if two transceivers are in use as transceivers for a long time, a function such as call waiting that informs of a call from a third party via the base station is provided. Apart from the case, it is inconvenient that the telephone call cannot be connected forever, so the above is considered to be specified in the standard.

Next, what can be concretely considered as a transceiver operation between slave units when such slave units are used as a transceiver will be described in detail with reference to flowcharts and time charts. First, regarding the transceiver operation of the handset 1 on the calling side,
A description will be given based on FIG. 8 and FIG.

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

In step S7, if a
When the minutes have elapsed (timeout, TO) (step S
8) The communication is automatically cut off according to the standard (step S9), and the calling handset 1 returns to the original standby state (step S10).

When the conversation ends before three minutes elapse during the call in step S7 and the user on the calling side performs an operation to disconnect the handset 1 (step S11), the three-minute timer stops. (Step S12), the communication is disconnected (step S13), and the calling handset 1 returns to the original standby state (step S14).

During the call in step S7, when the user of the slave unit 1 on the called side issues a disconnection instruction and the communication is cut off, a disconnection display is displayed on the slave unit 1 on the calling side (step S1).
5). At this time, the three-minute timer is also stopped (step S16), and the calling handset 1 returns to the original standby state (step S17).

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

In step S5, if the connection with the called handset 1 fails (step S22), the 3-minute timer is stopped (step S23).
Returns to the original standby state (step S24).

Next, the transceiver operation of the called handset 1 will be described with reference to FIGS. 9 and 10. FIG. From the standby state in step S1, the called handset 1 receives a call from the calling handset 1 and displays an incoming call (step S2). A ringtone is transmitted from the device 1 (step S3), and a three-minute timer starts (step S4).

As described above, when the called user performs a response instruction operation (step S6) for the called handset 1 in the response waiting state (step S5), communication is connected (step S6). Step S7), a call is started (Step S7)
8). After 3 minutes have passed while talking (step S
9) The call is automatically disconnected according to the standard (step S10), and the called 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 on the handset 1 before three minutes have passed since the end of the talk (step S12).
The minute timer stops (step S13), the communication is disconnected (step S14), and the called 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 for the slave unit 1 and the communication is disconnected, a disconnection display is displayed on the slave unit 1 on the called side (step S16). . At this time, the 3-minute timer is also stopped (step S17), and the called handset 1 returns to the original standby state (step S18).

Further, if the calling user issues a disconnection instruction for the slave unit and the communication is disconnected before issuing a response instruction from the response waiting in step S5 (step S6), the calling side slave unit 1 is notified. A disconnection display is performed (step S19). At this time, the 3 minute timer is also stopped (step S20),
The called handset 1 returns to the original standby state (step S21).

[0019]

However, for a user who uses the transceiver function between the slave units as described above, it takes three minutes even though the caller did not hang up during the call. The call is automatically disconnected, and you may be surprised or uncomfortable.
If it is necessary to continue the call, dial operation (call operation) from the beginning, as shown in FIG.
The communication must be re-established, and after 3 minutes, the call will be automatically disconnected and the communication must be re-established. .

Accordingly, the present invention provides a method for automatically re-calling a mobile communication terminal when communication is disconnected without performing a disconnection operation, and continuing the call again as if the communication were not disconnected. It is an object of the present invention to provide a mobile communication terminal and a communication reconnection system capable of the communication.

[0021]

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

(1) As means used when used as a calling side, calling means for making a call to the called side, storage means for storing the telephone number of the called side, and disconnection by the user Determining means for determining whether or not the communication has been disconnected without performing the operation; and when the determining means determines that the communication has been disconnected without performing the disconnection operation, the telephone stored in the storage means. Calling control means for controlling the calling means so as to cause the called side of the number to make a recall without a ring tone.

(2) Response means for responding to an incoming call from the calling side, storage means for storing the telephone number of the calling side, and means for use when used as the called side. Determining means for determining whether the communication has been disconnected without performing the disconnection operation, and determining whether the telephone number of the calling side that has received the call after disconnection is the same as the telephone number stored in the storage means before disconnection The second determining means and the determining means determine that the communication has been disconnected without performing the disconnection operation, and the telephone number of the calling party called by the second determining means is stored in the storage means. And a response control means for controlling the response means so as to automatically make a response again even if no response operation is performed by the user when the telephone number is determined to be the same as the telephone number.

(3) Calling means for making a call to the called side, storage means for storing the telephone number of the called side, and disconnection by the user as means used when used as the calling side. Determining means for determining whether or not the communication has been disconnected without performing the operation; and when the determining means determines that the communication has been disconnected without performing the disconnection operation, the telephone stored in the storage means. Calling control means for controlling the calling means so as to cause the called side of the number to make a re-call without a ring tone, and a means for receiving a call from the calling side as means used when used as the called side. Response means, a storage means for storing the telephone number of the calling side, a determination means for determining whether or not communication has been disconnected without the user performing a disconnection operation, and a call received after disconnection. Caller's phone number before disconnect Second determining means for determining whether the telephone number is the same as the telephone number stored in the storage means; and determining that the communication has been disconnected without performing the disconnection operation by the determining means, and receiving the call by the second determining means. If it is determined that the telephone number of the calling party is the same as the telephone number stored in the storage unit, the response unit is automatically re-answered without performing a response operation by the user. Response control means for controlling.

[0025]

According to the portable communication terminal having such a configuration, the communication is disconnected by the user of the portable communication terminal on either the calling side or the called side by the discriminating means. If it is determined that the communication has been disconnected without performing the disconnection operation by the determining means, the calling means is controlled by the calling control means and the calling side of the calling side is determined. The portable communication terminal performs a recall operation without a ring tone to the called portable communication terminal, and the response control means controls the response means of the recalled caller portable communication terminal. Even if the user does not perform the response operation, the communication is automatically re-responsive and the communication is reconnected.

For this reason, if the communication is disconnected without the user's disconnection operation being performed, even if the communication is actually disconnected, a re-call operation is performed without a ring tone in a short time,
Since the communication is automatically re-answered and the connection is re-connected without performing the response operation, it is possible to continue the call again as if the communication was not disconnected, and it was somewhat `` a little strange '' By giving it, it is possible to prevent the user from being surprised or unpleasant feeling, and it is not necessary to redo the dial operation from the beginning, so it is possible to continue talking as much as necessary without worrying about time Operability can be significantly improved.

Conventionally, Japanese Patent Application Laid-Open No. 5-276101
JP-A-5-276111 and JP-A-5-3276
In each of the publications related to No. 07, there is described a wireless telephone device having a function of automatically performing a recall process when a line is disconnected without a call end operation during a call. It is the same as the conventional one in that a ring tone sounds as in the case of calling, and communication is not reconnected unless the key operation for answering is performed on the called side. On the other hand, according to the present invention, a call is made without ringing when a call is re-established, and the called party does not need to perform key operations for answering the call, and the call is automatically answered. Can be used to make it seem as if it had continued.

[0028]

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

In FIG. 1, reference numeral 30 is a master unit of the PHS, and reference numeral 1 is its slave unit. The PHS master unit 30 and the handset 1 communicate wirelessly (cordless) indoors, and the user of the handset 1 communicates with the user of the distant telephone via the master unit 30. can do.

The PHS handset 1 can also be used as a portable communication terminal. That is, as shown in FIG. 2, the slave unit 1 communicates with the nearest base station 2a wirelessly outdoors, and the base station 2a is connected to another base station 2b via a management center 4 connected by wire. Another mobile phone 1b (the other party) by radio from the base station 2b
You can talk to Alternatively, the base station 2a is connected to a room telephone 5 (the other party) connected by a wire via the management center 4, and the child device 1 can also talk with the room telephone 5.

As shown in FIG. 3, the PHS handset 1 has:
It is possible to communicate directly 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 can be performed indoors, and a call can be made not only inside the service area but also outside the service area. That is, a call can be directly made between slave units without going through a base station.

As shown in FIG. 4, the PHS handset 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, an audio signal processing unit 15 connected to a speaker 16 and a microphone 17, ROM and RAM for storing information
And the like, a determining means 19 for determining whether communication has been disconnected without the user performing a disconnection operation, and a telephone number stored in the storing means 18 based on a signal from the determining means 19. Call control means 20 for controlling the wireless transmission / reception unit 23 to cause the called side to make a call again without a ring tone, and the telephone number of the called side after the disconnection is stored in the storage means 18 before disconnection. A second call from the calling side of the telephone number stored in the storage means 18 based on signals from both the second discriminating means 22, the discriminating means 19 and the second discriminating means 22 for discriminating whether the telephone number is the same as the telephone number. A response control unit 21 for controlling the wireless transmission / reception unit 23 to automatically re-respond even if a response operation is not performed by the user, and a wireless transmission / reception unit for transmitting / receiving a wireless communication with the base station 23, In addition, a central unit that controls 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 control unit 25 is provided.

The storage means 18 stores the telephone number of the terminal of the other party during a call. Therefore, when the handset 1 is used as the calling side, the storage means 18 stores the telephone number of the called terminal, and when the handset 1 is used as the called side, the storage means 18 Stores the telephone number of the calling terminal.

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

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

First, the transceiver operation of the calling handset 1 will be described with reference to FIGS. Steps S1 to S3 are the same as the operations in FIG. 8 described above.
Next, the telephone number of the handset 1 of the call destination (called side) is stored in the storage means 18 (step S4), and then a 3-minute timer is started (step S5). After waiting the response of the handset 1 (step S6) in this way, the called handset 1 responds and a response is displayed on the calling handset 1 (step S7), and the call starts. (Step S
8).

When a call is made in step S8, the discriminating means 19 times out (TO) three minutes according to the standard without the disconnection operation being performed by the calling or called user.
If it is determined that the connection has been cut because of the
9) At the same time as the communication is cut off (step S10), a two-second timer starts (step S11), and the calling handset 1 enters a state of waiting for a recall (step S12).

Thereafter, when a timeout of 2 seconds according to the standard times out (step S13), a calling operation without a ring tone is performed to the other party of the telephone number stored in the storage means 18, ie, the other party who was talking immediately before disconnection. (Step S14), a three-minute timer starts (step S1).
5) The handset 1 on the calling side is in a state of waiting for a response again (step S16).

When the called handset 1 responds, a response is displayed on the calling handset 1 (step S17), and the call is started (step S18). Thereafter, the handset 1 on the calling side returns to before step S8 and repeats the above operation.

In the slave unit 1 waiting for a response in step S16, if the user performs an operation of disconnecting the slave unit 1 on the calling side before the other slave unit 1 answers ( (Step S19) The 3-minute timer is stopped (Step S20), and the communication is disconnected (Step S21), and the calling handset 1 returns to the original standby state (Step S22).

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

In the slave unit 1 waiting for a recall in step S12, if the disconnecting operation is performed by the calling user before two seconds have elapsed (step S2).
6) The 2 second timer stops (step S27).
The communication is cut off (step S28), and the calling handset 1 returns to the original standby state (step S29).

When the user of the calling handset 1 has performed a disconnection instruction operation on the handset 1 after the end of the call in step S8 (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 called user issues a disconnection instruction and the communication is disconnected before three minutes have elapsed during the call in step S8, a disconnection display is displayed on the calling handset 1 (see FIG. 4). Step S34). At this time, the three-minute timer is also stopped (step S35), and the calling handset 1 returns to the original standby state (step S36).

If the calling user gives a disconnection instruction after the response waiting state in step S6 and before the called side answers (step S37), the 3-minute timer stops (step S38). Is disconnected (step S39), and the calling handset 1 returns to the original standby state (step S40).

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

Next, the operation of the transceiver of the called handset 1 according to the above embodiment will be described with reference to FIGS. 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). The child device 1 enters a response waiting state (step S6).

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

When the discriminating means 19 determines that the call has been disconnected due to a three-minute timeout without performing the disconnection operation by the calling or called user (step S10). At the same time, the communication is cut off (step S11), a 10-second timer is started (step S12), and the called handset 1 enters a state of waiting for a re-call (step S13). In this way, by adopting the 10-second timer on the called side in contrast to the 2-second timer on the calling side, it is possible to prevent a delay in timer measurement and to ensure that the calling side can make a call from the calling side. A call can be received.

When an incoming call is made, an incoming call is displayed on the incoming handset 1 (step S14). In this case, no ring tone is sent to the incoming handset 1. ing.
Then, the 10-second timer is stopped (step S15), and the 3-minute timer is started (step S16). Next, a determination is made as to whether or not the calling side has the same telephone number as the calling side from which the call was disconnected immediately before (step S17).

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

As described above, by automatically re-answering a re-arrived call without a ring tone, the user can make a continuous call without being aware of the disconnection of the call. You can get the feeling of being. After step S19, the process returns to step S9, and the above operation is repeated.

In step S17, if the telephone number of the called party is different from that of the other party in step S9 (different), the process returns to step S5 to repeat the above operation.

In step S13, if 10 seconds time out without calling from the calling side again (step S20), the called handset 1 returns to the original standby state (step S21). .

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

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

In step S9, if the communication is cut off by the calling side user giving a disconnection instruction before the lapse of three minutes, a disconnection display is displayed on the called handset 1 (step S9). S30). At this time, the three-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 issues a disconnect instruction before the called user issues a response instruction, the communication is disconnected.
The disconnection display is performed on the called handset 1 (step S3).
3). At this time, the three-minute timer is also stopped (step S
34), the called handset 1 returns to the original standby state (step S35).

In the above embodiment, a case has been described in which a PHS slave is used as a portable communication terminal. However, the present invention can be applied to a mobile phone other than the PHS slave.

In the above embodiment, the portable communication terminal uses means for both the automatic re-call function and the automatic re-answer function (the storage means 18, the determination means 19, the call control means 20,
The case of having the second determination means 22, the response control means 21, and the wireless transmission / reception section 23 has been described. However, 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-response function (storage means 18, discriminating means 1)
9, the second determination unit 22, the response control unit 21, and the wireless transmission / reception unit 23). By reducing the number of functions and components, the size and cost of the mobile communication terminal can be reduced.

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

In addition to the case of disconnection due to a three-minute timeout, if the disconnection operation is not performed and the communication is disconnected for any reason, the communication terminal is automatically reconnected. Is also good.

Further, in the above embodiment, the case where the portable communication terminal is used as the transceiver has been described. The present invention can be applied when communication is disconnected without performing a disconnection operation for a reason.

[0065]

As described above, according to the present invention, if the communication is disconnected without the user's disconnection operation, even if the communication is actually disconnected, the ring tone is generated within a short time. The call is re-activated without a response, and the call is automatically re-answered without performing a response operation, and the communication is reconnected, so that it is possible to continue the call again as if the communication was not disconnected, It can prevent the user from being surprised or uncomfortable, and it is not necessary to redo the dial operation from the beginning, so it is possible to continue talking as much as necessary without worrying about time, and operability Can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a PHS master device 30 and a slave device 1 according to an embodiment of a portable communication terminal according to the present invention.

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

FIG. 3 is a diagram illustrating a case where PHS slaves are used as a transceiver for a call;

FIG. 4 is a block circuit diagram showing a configuration of a slave unit 1 as a portable communication terminal.

FIG. 5 is a flowchart illustrating a transceiver operation of the calling handset 1 as the portable communication terminal according to the embodiment of the present invention.

FIG. 6 is a flowchart illustrating a transceiver operation of the called handset 1 as the portable communication terminal according to the embodiment of the present invention.

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

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

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

[Explanation of symbols]

 1, 1b, 1c PHS handset 2a, 2b Base station 4 Management center 5 Indoor telephone 8 Operation unit 10 Display unit 15 Audio signal processing unit 16 Speaker 17 Microphone 18 Storage unit 19 Judgment unit 20 Call control unit 21 Response control unit 22 Second discriminating means 23 Wireless transmitting / receiving unit 25 Central control unit 30 Master unit

──────────────────────────────────────────────────続 き Continuing from the front page (72) Shoichi Morokuma 2-1-1 Kagahara, Tsuzuki-ku, Yokohama-shi, Kanagawa Prefecture Inside the Yokohama Office of Kyocera Corporation (72) Inventor Yoshitaka Ueki 2 Kagahara, Tsuzuki-ku, Yokohama-shi, Kanagawa 1-1 Kyocera Corporation Yokohama Office (56) References JP-A-7-107560 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) H04B 7/24-7/26 102 H04Q 7/00-7/38

Claims (4)

(57) [Claims] 1. Means used when used as a calling side are: calling means for performing a call operation to a called side; storage means for storing a telephone number of the called side; Determining means for determining whether communication has been disconnected by performing a disconnection operation by a user of one of the communication terminals on the calling side, or whether communication has been disconnected without performing the disconnection operation; When it is determined that the communication is disconnected by performing the disconnection operation by the determination unit, the calling unit is controlled so that a call is received to the called side with a ring tone at the time of manual recall, and the disconnection is performed. When it is determined that the communication has been disconnected without performing the operation, the receiving side of the telephone number stored in the storage means is automatically re-called so as to receive a call without a ringtone. Call control to control calling means Portable communication terminal characterized by comprising a means. And means for responding to an incoming call from the calling side, storage means for storing the telephone number of the calling side, and means for using the calling side. A determination unit that determines whether communication has been disconnected by performing a disconnection operation by a user of one of the communication terminals on the called side, or whether communication has been disconnected without performing the disconnection operation, A step of determining whether the telephone number of the calling party that has re-arrived without a ring tone after the communication is disconnected without performing the disconnection operation is the same as the telephone number stored in the storage means before disconnection. 2 discriminating means, and the discriminating means discriminates that the communication has been disconnected without performing the disconnection operation, and the second discriminating means determines the telephone number of the calling side that has re-arrived without a ringtone. The electric power stored in the storage means Response control means for controlling the response means to automatically re-respond even if no response operation is performed by the user when it is determined that the number is the same as the number. Terminal. 3. Means used when used as a calling side are: calling means for making a call to the called side; storage means for storing the telephone number of the called side; Determining means for determining whether communication has been disconnected by performing a disconnection operation by a user of one of the communication terminals on the calling side, or whether communication has been disconnected without performing the disconnection operation; When it is determined that the communication is disconnected by performing the disconnection operation by the determination unit, the calling unit is controlled so that a call is received to the called side with a ring tone at the time of manual recall, and the disconnection is performed. When it is determined that the communication has been disconnected without performing the operation, the receiving side of the telephone number stored in the storage means is automatically re-called so as to receive a call without a ringtone. Call control to control calling means Means for responding to an incoming call from the caller, storage means for storing the telephone number of the caller, and means for using the caller. A determination unit that determines whether communication has been disconnected by performing a disconnection operation by a user of one of the communication terminals on the called side, or whether communication has been disconnected without performing the disconnection operation, A step of determining whether the telephone number of the calling party that has re-arrived without a ring tone after the communication is disconnected without performing the disconnection operation is the same as the telephone number stored in the storage means before disconnection. 2 discriminating means, and the discriminating means discriminates that the communication has been disconnected without performing the disconnection operation, and the second discriminating means determines the telephone number of the calling side that has re-arrived without a ringtone Stored in the storage means Response control means for controlling the response means to automatically re-respond if the response is determined to be the same as the telephone number even if no response operation is performed by the user. Terminal. 4. When communication is disconnected by a user of a communication terminal on either the calling side or the called side performing a disconnection operation, the communication terminal on the called side is re-established at the time of manual re-calling. A re-call operation is performed so that a call is received with a ring tone, and if the communication is disconnected without performing the disconnection operation, the calling communication terminal is accompanied by a ring tone with the called communication terminal. The caller automatically performs a re-call operation to receive a call without making a call, and the called-side communication terminal, which is automatically re-called and re-received without a ring tone, performs a response operation by the user. A communication reconnection system for a portable communication terminal, wherein a communication is automatically reconnected even if no response is made to reconnect the communication.