JP5443572B1 - Communication terminal - Google Patents

Abstract

A communication terminal capable of preventing use by a person other than a regular user while suppressing a decrease in operability.
A storage unit for storing a voice print of a regular user of a communication terminal, a microphone for inputting a voice of a user using the communication terminal, and a voice print of a voice input by the microphone. The communication terminal 10 based on the voice processing unit 115 to be acquired, the voiceprint matching unit 122 that matches the voiceprint acquired by the voice processing unit 115 and the voiceprint stored in the storage unit 112, and the matching result of the voiceprint matching unit 122. The control part 111 which restricts use of is provided.
[Selection] Figure 2

Description

  The present invention relates to a communication terminal capable of inputting voice.

  When connecting to various networks from a communication terminal or using net banking or online mail order, it is important to verify the identity of the user of the communication terminal in order to prevent unauthorized use by others other than authorized users. In order to confirm the identity of the user of the communication terminal, it is common to input the identity and password of the identity. In recent years, communication terminals that perform identity verification using fingerprints or voiceprints are known in order to save time and labor for inputting IDs and passwords and to prevent impersonation of the person.

  For example, in Patent Document 1, when power is turned on, voice data (voice print) input from a microphone is collated with voice data (voice print) of a password registered in advance, and a lock is found if both match. A mobile phone that can prevent misuse by releasing the state is disclosed.

  Usually, a communication terminal such as a mobile phone is not turned off completely so as to be able to receive calls and mails at any time, and is often kept in a standby state. However, although the mobile phone of Patent Document 1 performs identity verification by collating password voiceprints when the power is turned on, there is a risk of unauthorized use by a person other than the authorized user when returning from the standby state. There is. For this reason, it is desirable to perform identity verification every time when returning from the standby state. However, if identity verification is performed every time when returning from the standby state, it takes time and effort, and the operability deteriorates and the user feels stress. There is a fear. In particular, mobile phones called smartphones, whose number of users has been increasing in recent years, are often set so that the screen display disappears in a short time and enters a standby state in order to prevent the battery from being consumed. If identity verification is performed every time, operability is significantly reduced.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a communication terminal capable of preventing use by a person other than a regular user while suppressing a decrease in operability. .

In order to achieve the above object, the invention of claim 1 is a communication terminal capable of inputting voice, and uses a storage means for storing a voice print of a regular user of the communication terminal and the communication terminal. Voice input means for inputting a user's voice, voice print acquisition means for acquiring a voice print of the voice input by the voice input means, voice print acquired by the voice print acquisition means, and stored in the storage means It is characterized by comprising voiceprint matching means for matching a voiceprint, and use restriction means for restricting the use of the communication terminal based on the result of matching by the voiceprint matching means.
According to this communication terminal, the voice print of the voice uttered by the user who actually uses the communication terminal is checked against the voice print of the authorized user stored in the storage means, and based on the check result It is possible to confirm whether the person who actually uses the communication terminal is an authorized user. And when the person who actually uses the communication terminal is not a regular user, the use of the communication terminal by a person other than the regular user can be prevented by restricting the use of the communication terminal. In addition, when voice is input to the communication terminal, the identity of the voice terminal is checked and the use of the communication terminal is restricted if the user is not a legitimate user. Therefore, the identity is confirmed every time the power is turned on or when returning from the standby state. Compared with the case where the use restriction is canceled by performing the above, it is possible to suppress a decrease in operability when the communication terminal is used.
Here, the “regular user” is a legitimate user who is authorized to use the communication terminal. For example, the owner of the communication terminal or a communication service using the communication terminal with a communication provider. It is also possible to include authorized users other than the owner / contractor who is a contracted contractor and is permitted to use the communication terminal.

  In the communication terminal, the use restricting means may restrict the use of the communication terminal when the voiceprint matching by the voiceprint matching means is not consistent for a predetermined number of times. According to this communication terminal, it is possible to prevent the use by an authorized user from being erroneously restricted due to the case where noise is included in the input voice.

  Further, in the communication terminal, when the use restricting means restricts the use of the communication terminal, a notifying means for notifying, via the communication network, a notification destination designated in advance that the use of the communication terminal is restricted. Further, it may be provided. According to this communication terminal, when the use of the communication terminal is restricted, a notification destination specified in advance is notified via the communication network, so that the communication terminal is a non-regular user. Can be informed by the user. Receiving this notification, authorized users, etc. can minimize the damage caused by use by anyone other than authorized users by taking steps to stop the use of the communication terminal with the telecommunications carrier. .

  The communication terminal may further comprise voiceprint registration means for acquiring the voiceprint of the authorized user and storing it in the storage means. According to this communication terminal, since the voice print of the authorized user can be added and stored in the storage means, the probability of matching by voice print matching and the accuracy of voice print matching can be improved. In addition, it is possible to allow a specific person other than the owner as a regular user of the communication terminal to use the communication terminal without restricting the use of the specific person.

  The communication terminal further includes voice recognition means for recognizing the voice inputted by the voice input means, wherein the use restriction means is a voice recognition result by the voiceprint matching means and voice recognition by the voice recognition means. The use of the communication terminal may be restricted based on the result. According to this communication terminal, it is possible to determine whether the user using the communication terminal is an authorized user based on not only the result of voiceprint matching but also the result of speech recognition. Will improve. Even if voiceprint matching fails, it is possible to determine whether or not the user using the communication terminal is an authorized user using the result of voice recognition. The probability of being able to improve.

  ADVANTAGE OF THE INVENTION According to this invention, the use by persons other than a regular user can be prevented, suppressing the fall of operativity.

The schematic block diagram which shows an example of the communication system which can communicate, such as a telephone call, using the communication terminal which concerns on embodiment of this invention. The block diagram which shows an example of the hardware constitutions of the communication terminal of this embodiment. The flowchart which shows an example of the procedure which registers a voiceprint in the communication terminal of this embodiment. The flowchart which shows one operation example at the time of the telephone call start of the communication terminal of this embodiment. The flowchart which shows the other operation example at the time of the telephone call start of the communication terminal of this embodiment. The flowchart which shows the further another operation example at the time of the telephone call start of the communication terminal of this embodiment. The front view which shows an example of the result of the voiceprint collation mismatch displayed on the screen of a communication terminal in the operation example of FIG. The front view which shows an example of the terminal locked state displayed on the screen of a communication terminal in the operation example of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram illustrating an example of a communication system capable of performing communication such as a call using a communication terminal according to an embodiment of the present invention. This communication system uses a mobile communication network 30 including a base station 301 and the like for communication using mobile communication terminals 10 and 11 and a fixed telephone 21 provided in a public telephone 20, a home, an office, or the like. And a public telephone communication network 31 for this purpose. In addition, the communication system of the present embodiment includes an exchange, a dedicated line, a router, a firewall, various servers, and the like (not shown).

  In the present embodiment, the communication terminals capable of inputting voice include the mobile communication terminals 10 and 11, the public telephone 20, the fixed telephone 21, and a computer device such as a notebook computer having a mobile communication module. In the following description, a communication terminal (communication terminal that originates a call) to which the present invention is applied is a mobile communication terminal (hereinafter referred to as “calling terminal” as appropriate) 10, and other mobile A case will be described in which the communication terminal 11, the public telephone 20, the fixed telephone 21, and the like are communication terminals on the incoming side (hereinafter referred to as “incoming side terminals” as appropriate).

  In the communication system of the present embodiment, the mobile communication terminals 10 and 11 can communicate with each other via the base station 301 of the mobile communication network 30. Further, the public telephone 20 and the fixed telephone 21 can communicate via the public telephone communication network 31. The mobile communication terminals 10 and 11 and the public telephone 20 and the fixed telephone 21 can communicate with each other via the mobile communication network 30 and the public telephone communication network 31.

  In the present embodiment, the transmitting terminal 10 analyzes the frequency component of the waveform data of the voice of the person who actually transmitted the voice from the transmitting terminal 10 (hereinafter simply referred to as “sender”) during the call. The communication terminal obtains the voiceprint of the caller, collates the voiceprint of the caller with the voiceprint of the user of the caller terminal 10 stored in advance, and restricts the use based on the result of the voiceprint matching. .

  Here, the “voice print” is a visual display of temporal changes of each frequency component of the voice. For example, examples of the voice print include a sound graph obtained by frequency-analyzing a sound and a tone pattern of a sonagraph like a contour line of a map, and a voice expressed in a striped pattern by frequency analysis. Since this voiceprint shows the characteristics of the person who uttered the voice and shows a pattern unique to each person, like the fingerprint, it can be used for identification of the person, identity verification, various authentications, and the like.

FIG. 2 is a block diagram illustrating an example of a hardware configuration of the transmission-side terminal 10. Note that the mobile communication terminal 11 on the receiving side can also be configured in the same manner as the calling terminal 10.
In FIG. 2, the originating terminal 10 includes a control unit 111, a storage unit 112, a wireless communication unit 113, a voice processing unit 115, an image processing unit 118, an operation unit 120, a clock unit 121, and a voiceprint matching unit 122. A storage unit 112, a wireless communication unit 113, an audio processing unit 115, an image processing unit 118, an operation unit 120, a clock unit 121, and a voiceprint matching unit 122 are connected to the control unit 111. The control unit 111 is connected to a microphone 116 as a sound input unit and a speaker 117 as an output unit via an audio processing unit 115, and a display unit 119 is connected to the control unit 111 via an image processing unit 118.

  The control unit 111 includes, for example, a CPU, a memory, a system bus, and the like, and performs data transmission and reception with each unit such as the storage unit 112 and the wireless communication unit 113 by executing predetermined control programs and application programs. Or control each part. In addition, the control unit 111 is configured to have a function as a use restriction unit that restricts the use of the transmission side terminal 10 based on a collation result of a voice print collation unit such as a voice print collation unit 122 described later or a password authentication result. Also good.

  The clock unit 221 can output a clock signal used in the control unit 11 and the like, and can generate accurate date / time information.

  The storage unit 112 is configured by, for example, a semiconductor memory such as RAM or ROM, a magnetic storage medium, and the like, and can store a control program executed by the control unit 111 and various data. The storage unit 112 also functions as a storage unit that stores waveform data of the user's voice acquired by the voice processing unit 115 and voiceprint data obtained by analyzing the waveform data. In addition, the storage unit 112 also functions as a storage unit that stores voice print data of a regular user that is collated with the voice print of the caller's voice.

  Here, the “regular user” in the present embodiment is a legitimate user who is authorized to use the originating terminal 10, for example, the owner of the originating terminal 10 or communication using the originating terminal 10. A contractor who has contracted with a telecommunications carrier for services. This “regular user” may include authorized users who are permitted to use the originating terminal 10.

  The wireless communication unit 113 is controlled by the control unit 111 and performs wireless communication with the base station 301 of the mobile communication network 30 via the antenna 114 by a predetermined communication method. By this wireless communication, voice telephone communication (call) and transmission / reception of electronic mail can be performed with a communication terminal such as another mobile phone.

  The voice processing unit 115 encodes the transmission voice signal input from the microphone 116 by a predetermined method and sends the encoded signal to the control unit 111. Furthermore, the audio processing unit 115 also has an audio decoder function for decoding various digital sound data. For example, the voice processing unit 115 decodes the received voice signal received by the wireless communication unit 113 and outputs it from the speaker 117. The voice processing unit 115 also functions as voice print acquisition means for acquiring the voice print of the caller's voice received by the microphone 116. The voice processing unit 115 includes, for example, a CPU, a memory, an A / D converter, a D / A converter, and the like. In addition, a voice print acquisition process for acquiring a voice print of the caller's voice by performing frequency analysis or the like can be performed. The audio processing unit 115 may be configured by a semiconductor integrated circuit (ASIC) designed to be used for a specific application for performing various processes of the audio signal (waveform data), voiceprint acquisition processing, and the like. Note that the voice print collating unit 122 described later may have a function as a voice print obtaining unit that obtains a voice print of a caller's voice received by the microphone 116.

  Under the control of the control unit 111, the image processing unit 118 performs processing for displaying various images, various types of information such as voice print data, and a result of voice print collation described later on the display unit 119 including a liquid crystal display (LCD). Do.

  The operation unit 120 touches a data input key (ten key, * key, # key), a call start key, a call end key, a scroll key, a multi-function key, etc. displayed on the display unit 119, and makes or receives a call. In addition to the above operations, it is used for scrolling or selecting information displayed on the display unit 119. The operation unit 120 may be configured using a touch panel incorporated in the display unit 119 without using a key arranged in a predetermined area of the housing.

  Voiceprint registration means for acquiring the voiceprint of the authorized user of the sending terminal 10 and storing it in the storage unit 112 is configured using, for example, the voice processing unit 115, the display unit 119, the operation unit 120, and the like.

  The voiceprint collation unit 122 functions as a voiceprint collation unit that collates the voiceprint of the user (sender) voice received from the microphone 116 with the voiceprint of the authorized user stored in the storage unit 112 in advance. By collating the voiceprint, it is possible to determine whether the user who actually uses the transmitting terminal 10 is a regular user or to perform various authentications. The voiceprint collation unit 122 is constituted by, for example, a CPU, a memory, and the like, and can perform the voiceprint collation process and the like by executing a predetermined program. Further, the voiceprint matching unit 122 may be configured by a semiconductor integrated circuit (ASIC) designed to be used for a specific application for performing the voiceprint matching or the like. Further, the voiceprint matching unit 122 may be configured to transmit and receive voice data and voiceprint data to and from the storage unit 112, as indicated by a one-dot chain line in the drawing.

  Note that the voiceprint matching unit 122 may also be configured to have a function as voiceprint acquisition means for acquiring the voiceprint of the voice of the user (sender) received by the microphone 116 described above. The voiceprint matching unit 122 may also be configured to have a function as voice recognition means for recognizing the voice included in the voice signal.

  Here, “speech recognition” is a process of extracting the content spoken in the speech as character data (text data) in a predetermined language by analyzing the speech signal.

  The sending terminal 10 acquires the voice print of the user (sender) voice during a call as described above, collates the acquired voice print with the voice print of the authorized user stored in the storage unit 112 in advance, Based on the result of the voiceprint collation, use of the transmitting terminal 10 can be restricted, a user can be specified (identified), and various authentications can be performed on the user. For this reason, the voiceprint of the authorized user is registered and stored in advance in the transmitting terminal 10. These voiceprint registration procedures can be performed as follows, for example.

  FIG. 3 is a flowchart showing a procedure for registering a voiceprint by directly inputting voice to the caller terminal 10. Here, the operator who operates the transmission-side terminal 10 and the voiceprint registration target person to which the voiceprint is registered may be the same person or different persons. In the example of FIG. 3, the case where the operator and the voiceprint registration target person are the same person (hereinafter referred to as “registrant”) and the authorized user who is the owner of the transmitting terminal 10 will be described.

  As shown in FIG. 3, in order to register a voiceprint in the caller terminal 10, the registrant first operates the caller terminal 10 to select a voice registration mode displayed on the display unit 119 (step 101). The registrant inputs his / her name (step 102). As a result, the recording enters a standby state, and recording is started by selecting the recording start displayed on the display unit 119 (step 103).

  Next, the registrant clearly inputs a predetermined word or sentence (for example, his / her name, a predetermined password, or a virtual conversation sentence) toward the microphone 116 within a predetermined time (for example, 20 seconds). (Step 104). At this time, it is desirable to record in a quiet room so as not to pick up ambient noise. The recorded voice is preprocessed by the voice processing unit 115 to remove noise or the like as necessary, and then the waveform data of the voice is subjected to frequency analysis. Then, it is checked whether or not the voiceprint data obtained by the analysis is data that can be used for voiceprint matching (step 105).

  Here, when it is determined that the obtained voiceprint data is data that can be used for voiceprint matching (Yes in step 106), it is linked to the name or the user's own profile input separately. Is stored in the storage unit 112, and it is displayed that the voice registration has been completed normally, and the voice registration process is terminated (step 107).

  On the other hand, if it is determined that the obtained voiceprint data is data that cannot be used for voiceprint matching (No in step 106), the fact that the registration process has failed is displayed, and the recorded voice data Is deleted, and the recording process is repeated again (step 108).

  The name input in step 102 may be input when voiceprint data is stored in the storage unit 112 in step 107. If the registrant is the owner of the caller terminal 10, the name input itself may be omitted.

In addition, the recording of the voice in the above-described steps 103 and 104 is not limited to the method in which the registrant directly pronounces and records on the calling terminal 10, and the voice of the calling party received during the call with the calling party of the receiving terminal is You may record as a voiceprint registration person's voice. In addition, when the operator who operates the originating terminal 10 and the voiceprint registration target person are different persons and there is a voiceprint registration target person near the operator, the operator operates the calling terminal 10 to register the voiceprint. You may make it record a subject's audio | voice.
Further, the voice print registration target person whose voice voice print is registered in the caller terminal 10 in the procedure of FIG. 3 is, for example, the caller terminal, in addition to the regular user such as the owner of the caller terminal 10 and the contractor. Permitted users such as relatives or friends of authorized users who are permitted to use 10 may be used.

  FIG. 4 is a flowchart illustrating an operation example of the transmission-side terminal 10 according to the present embodiment. In the example of FIG. 4, a person who actually uses the caller terminal 10 is called a “caller”, a user of the callee terminal is called a “caller”, and the caller receives an incoming call from the callee terminal 11. A case will be described in which a telephone call is made to a person who makes a call.

  In FIG. 4, when the caller performs a call operation using the telephone number of the callee terminal 11 at the caller terminal 10, a call is made from the caller terminal 10 to the callee terminal 11. A call connection is established between the caller terminal 10 and the callee terminal 11, and a call is started (step 201).

  The caller's voice signal input from the microphone 116 of the caller terminal 10 is sent to the voice processor 115 and transmitted to the receiver terminal 11 via the controller 111 and the radio communication unit 113, and the voice processor 115. The frequency analysis is performed to obtain a voice print (steps 202 to 203). The voiceprint data obtained by the analysis of the voice signal is sent to the voiceprint matching unit 122 via the control unit 111, whereby the voiceprint matching unit 122 acquires the voiceprint to be checked (step 204).

  The voiceprint collation unit 122 collates the voiceprint data of the authorized user stored in the storage unit 112 with the voiceprint data of the caller obtained by the analysis of the voice signal (step 205). ).

  If the voiceprint data match each other in the voiceprint matching (Yes in step 206), it is confirmed that the caller is an authorized user of the caller terminal 10, so the voiceprint matching process is terminated and the call is made. Continued.

  On the other hand, if the voiceprint data does not match in the voiceprint matching (No in step 206), the caller is not an authorized user of the caller terminal 10, but is illegally used by a person other than the authorized user. Since there is a fear, the calling terminal 10 is locked and cannot be used (step 207), and the call with the receiving terminal 11 is also interrupted (step 208).

  FIG. 5 is a flowchart illustrating another operation example of the transmission-side terminal 10 according to the present embodiment. Note that steps 301 to 307 and 309 in FIG. 5 are the same as steps 201 to 208 in FIG.

  In the operation example of FIG. 5, if the voiceprint data does not match in the voiceprint matching (No in step 306), there is a risk of unauthorized use by a person other than the authorized user, so the calling terminal 10 can be locked and used. After disappearing (step 307), a message indicating that the originating terminal 10 has been locked (for example, a message that “the terminal has been locked due to unauthorized use”) is received by a synthesized voice or e-mail. It is transmitted to the notification destination (communication terminal or server such as another mobile phone or personal computer) via the communication network (step 308). After being notified that the originating terminal 10 has been locked, the call between the originating terminal 10 and the terminating terminal 11 that has been suspended is completely disconnected (step 309).

  FIG. 6 is a flowchart showing still another operation example of the caller terminal 10 according to the present embodiment. Note that steps 401 to 406, 410, and 412 in FIG. 6 are the same as steps 201 to 208 in FIG.

  In the operation example of FIG. 6, when the voiceprint data does not match in the voiceprint matching (No in step 406), as shown in the front view of the transmitting terminal 10 in FIG. Step 407). Since the caller cannot see the display unit 119 during a call when the caller terminal 10 is placed on his / her ear, even if a sub-voice such as “Anatano Seimonwa Fitch Death” is output from the speaker 117 to the silent part of the call Good. At the same time, input of a password for password authentication is requested (step 408).

  Next, the entered password is authenticated, and if the passwords match (Yes in step 409), the voiceprint collation is an error due to a collation error, and the caller is an authorized user of the caller terminal 10 Is confirmed, the password authentication process is terminated and the call is continued. On the other hand, if the passwords do not match in the password authentication (No in step 409), the caller is not a regular user of the calling terminal 10, and there is a risk of unauthorized use by a person other than the regular user. The calling terminal 10 is locked and cannot be used (step 410), and it is output and notified that the calling terminal 10 is locked (step 411).

  As a method for outputting and notifying that the originating terminal 10 is locked, for example, as illustrated in the front view of the originating terminal 10 in FIG. Is displayed. Note that since the caller cannot see the display unit 119 when the caller terminal 10 is put on his / her ear, a sub-audio such as “Tanmatsuga Rock Salemashita” may be output from the speaker 117. Further, as in the operation example of FIG. 5 described above, the same voice may be transmitted to the receiving terminal 11 via the communication network. In addition, the calling terminal 10 is properly used for a predetermined notification destination (for example, another mobile phone, a personal computer, or a predetermined server owned by the owner of the calling terminal 10) specified in advance in the calling terminal 10. An email may be sent to the effect that the user has been locked due to unauthorized use by a person other than the person.

  After being notified that the calling-side terminal 10 is locked, the call between the calling-side terminal 10 and the receiving-side terminal 11 that has been interrupted is completely disconnected (step 412). Since the calling terminal 10 remains locked and cannot be used, a person other than the authorized user makes a call with another communication terminal, looks at the contents of an email, or steals address book data. It is possible to prevent unauthorized use.

  In addition, the owner of the transmission side terminal 10 may lend the transmission side terminal 10 to an acquaintance or family, and the acquaintance or family may become the originator. In this case, it is not necessary to lock the transmitting terminal 10 even if the voiceprints do not match. For this reason, in the voiceprint collation in step 406, for example, when the voiceprint collation does not coincide continuously for a predetermined number of times (for example, three times), the password authentication process may be performed. The predetermined number of times can be set as appropriate at the caller terminal 10.

  Further, the password input in the password authentication is not limited to the method of manually inputting to the display unit 119, and may be input by voice. In this case, when the voice print described with reference to FIG. 3 is registered, for example, a voice signal of “password” as a predetermined keyword uttered by the registrant is converted into text data by the voice processing unit 115 and stored. Stored in the unit 112. Then, when inputting the password in step 408, a voice “Please pronounce your password” is output from the speaker 117, and the caller pronounces it. The voice of the password is received by the microphone 116, and the voice signal of the password received by the voice processing unit 115 is converted into text data and compared with the password stored in the storage unit 112. If the passwords match, the caller can be recognized. In this way, the operability is better than when the password is input manually by voice.

  As described above, according to the present embodiment, when a call between the calling-side terminal 10 and the receiving-side terminal 11 is started, it is acquired from the voice uttered by the user (caller) of the calling-side terminal 10. The voice print and the voice print of the authorized user stored in the storage unit 112 are collated, and voice print authentication is performed to determine whether or not the caller who actually uses the caller terminal 10 is the authorized user. As described above, since the identity verification is performed by the voiceprint when the call of the calling terminal 10 is started, it is possible to suppress a decrease in operability as compared with the case where the identity verification is always performed every time the power is turned on or when returning from the standby state. At the same time, security can be ensured by preventing unauthorized use by persons other than authorized users.

In the above-described embodiment, the case where voiceprint collation, use restriction, password authentication, and the like are performed by the transmission-side terminal 10 may be performed, but may be performed by the reception-side terminal 11. In this case, it is possible to prevent the receiving terminal 11 from being illegally used by a third party.
Moreover, although the said embodiment demonstrated the case where voiceprint collation, use restrictions, password authentication, etc. were performed at the time of the telephone call start in a communication terminal, you may carry out at the time of another voice input. For example, in the case of a communication terminal capable of performing various operations and various searches by voice input, the above-described voiceprint matching, use restriction, password authentication, and the like may be performed at the start of the voice input.

DESCRIPTION OF SYMBOLS 10,11 Mobile communication terminal 20 Public telephone 21 Fixed telephone 30 Mobile communication network 31 Public telephone communication network 111 Control part 112 Memory | storage part 113 Wireless communication part 114 Antenna 115 Audio | voice processing part 116 Microphone 117 Speaker 118 Image processing part 119 Display part 120 Operation unit 121 Clock unit 122 Voiceprint collation unit 301 Base station

JP-A-8-223281

Claims (3)

A communication terminal capable of inputting voice,
Storage means for storing a voice print of an authorized user of the communication terminal;
Voice input means for inputting the voice of the user using the communication terminal;
A voiceprint acquisition unit that acquires a voiceprint of a voice at the start of a call that is input by the voice input unit when a user using the communication terminal starts a call by calling a destination ;
Voiceprint collation means for collating the voiceprint acquired by the voiceprint acquisition means with the voiceprint stored in the storage means;
Operation means for a user using the communication terminal to enter a password;
Use restriction means for restricting the use of the communication terminal based on the collation result of the voiceprint collation means ,
The use restriction means is
When the voiceprint matching by the voiceprint matching means is successful, the user who uses the communication terminal is not requested to input the password, and the use of the communication terminal is not restricted,
If the voiceprint matching by the voiceprint matching means is not successful, the user who uses the communication terminal is requested to input a password, and the password entered by the user by the operation means is authenticated, The use of the communication terminal is not restricted when the password authentication is successful, the use of the communication terminal is restricted when the password authentication is not successful, and the call with the callee is disconnected. A communication terminal characterized by. The communication terminal according to claim 1 , wherein
When the use restriction means restricts the use of the communication terminal, the use restriction means further comprises a notification means for notifying a predetermined notification destination via the communication network that the use of the communication terminal is restricted. Communication terminal. In the communication terminal according to claim 1 or 2 ,
A communication terminal further comprising voiceprint registration means for acquiring the voiceprint of the authorized user and storing it in the storage means.

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