JP2008177928A - Communication system and sender information display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication system capable of reading sender information whose adequacy is guaranteed to specify a sender and displaying the sender information. <P>SOLUTION: The communication system comprises an originating terminal having a communication means of performing speech communication using IP packets, a sender information storage means of storing sender specification information whose adequacy is guaranteed to specify the sender; and a terminating terminal having a communication means of performing speech communication using IP packets, a display means of displaying the sender information, a sender information authenticating means of authenticating the sender specification information, and an information display control means of authenticating the sender specification information received by the sender authenticating means when the sender specification information is received, and displaying the sender specification information having been authenticated on a display means. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a communication system and a communication information display method capable of displaying communication information with a guaranteed validity for specifying a communication person.

In order to make it possible to check caller information even when an incoming call is received from a caller who is not registered in the telephone directory of the telephone, when a call notification is received for a voice call, the caller's phone number is obtained from the incoming call information. Based on the acquired telephone number, a caller information is searched from a telephone directory database inside the telephone, and if the caller information is not found, a telephone that performs a caller information search using the Internet is known (for example, Patent Document 1).
JP 2004-1537779 A

  By the way, in recent years, IP telephones using IP packets have been used. However, in the telephone shown in Patent Document 1, outgoing calls related to telephone number information included in incoming information are provided. Since the caller information included in the IP packet is misrepresented, the caller information cannot be reliably confirmed. That is, since the telephone described in Patent Document 1 displays a telephone number, if the telephone number is spoofed by falsifying an IP packet, whether the telephone number is a valid telephone number or not. There is a problem that cannot be judged.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a communication system and a caller information display method capable of making a call with a correct partner in a safe manner by using means for specifying a call partner.

  The present invention provides a communication means for performing a voice call, a communication person information storage means for storing communication person identification information guaranteed to be legitimate for specifying a communication person, and when the transmission is detected by the communication means, A first communication terminal comprising a communication person information transmitting means for reading out and transmitting the communication person specifying information stored in the communication person information storage means, a communication means for performing a voice call, and display of caller information Display means, a communication person information authentication means for authenticating the communication person identification information, and when the communication person identification information is received, the communication person identification information received by the communication person authentication means can be authenticated and authenticated. And a second communication terminal comprising information display control means for displaying the communication person specifying information on the display means.

  The communication person specifying information according to the present invention is characterized in that the first and second communication terminals specify information of a caller that transmits communication or information of a callee that receives communication.

  The present invention is characterized in that the communication person specifying information includes position information or movement history of transmission of the first communication terminal.

  The present invention is characterized in that the second communication terminal is provided with a communication person specifying information storage means, and related history information is displayed on the display means in addition to the communication person specifying information at the time of the call during a call.

  The present invention relates to a first communication terminal comprising a communication means for performing a voice call, and a communication person information storage means for storing communication person specifying information guaranteed to be legitimate for specifying a caller, and a voice call. A communication information display method in a communication system comprising a communication means for performing communication and a second communication terminal provided with a display means for displaying communication information, wherein the first communication terminal communicates with the communication means. A communication person information transmitting step of reading and transmitting the communication person identification information stored in the communication person information storage means when the start is detected; and the second communication terminal receives the communication person identification information In this case, a communication person information authentication step for authenticating the communication person identification information, and information for displaying on the display means the communication person identification information that the second communication terminal can authenticate in the communication person authentication step. And having a 示制 your step.

  According to the present invention, the caller information is read in order to identify the caller before the call, and this information is authenticated, and the caller identification information is displayed as necessary. The caller information with guaranteed performance can be confirmed by display, and the effect that the user can talk with confidence can be obtained. Further, since the authentication result of the communication person specifying information is displayed, the communication person can be surely confirmed.

  Hereinafter, a communication system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment. In this figure, reference numeral 1 denotes a mobile terminal device (hereinafter referred to as a transmission terminal) that performs transmission. Reference numeral 2 denotes a mobile terminal device (hereinafter referred to as an incoming terminal) that should receive an outgoing call from the outgoing terminal 1. The transmitting terminal 1 and the receiving terminal 2 are the same mobile communication terminal device as the first communication terminal and the second communication terminal, but for the sake of convenience, as the transmitting terminal 1 and the receiving terminal 2, It is illustrated and described by changing the reference numerals. The sending terminal 1 and the receiving terminal 2 can actually send and receive each other. Reference numerals 3 and 4 are base stations that establish information communication with each of the transmitting terminal 1 and the receiving terminal 2 by establishing a wireless communication line. Reference numeral 5 denotes a communication network to which the base stations 3 and 4 are connected. Reference numeral 6 denotes a certificate authority that issues a certificate for authenticating transmitted / received information connected to the communication network 5.

Reference numeral 11 denotes a control unit that performs overall control of processing operations of the transmission terminal 1. Reference numeral 12 denotes an input unit composed of dial keys, function keys, and the like. Reference numeral 13 denotes a display unit including a liquid crystal display. Reference numeral 14 denotes a microphone that collects the voice of the speaker. Reference numeral 15 denotes a speaker that emits the voice of the other party. Reference numeral 16 denotes an audio processing unit that converts an IP packet into an audio signal and generates a sound from the speaker 15 and converts the audio signal detected by the microphone 14 into an IP packet. Reference numeral 17 stores information for identifying the sender, and the root certificate of the root certificate authority for confirming the validity of the caller identification information transmitted from the calling terminal when an incoming call is received. It is a storage unit that is stored. Reference numeral 18 denotes a wireless communication unit that performs wireless communication with the base station.
Note that the configuration of the receiving terminal 2 is the same as the configuration of the transmitting terminal 1, and thus detailed description thereof is omitted.

  First, with reference to FIG. 1, the sender identification information written in the storage unit 17 as the communication person identification information and the authentication process of this information will be described. The storage unit 17 of the transmitting terminal 1 stores the name of the affiliation (company name, etc.), the name, the telephone number, the image information of the face photo, etc., which is the sender information, and the hash value obtained from the sender information as a secret key. , The signer's electronic certificate authenticated by the certificate authority 6, and the root certificate of the root certificate authority used to confirm the validity of the signer's electronic certificate are written. In addition, a secret key used for challenge response authentication is written in the storage unit 17 in a place where it cannot be read from the outside, and only the control unit 11 can access this secret key.

  When a call is made from the sending terminal 1 having the storage unit 17 in which the sender information, signature information, the signer's electronic certificate, and these information are called sender specification information, to the receiving terminal 2 The control unit 11 reads the caller identification information recorded in the storage unit 17 and transmits this information to the call destination (the receiving terminal 2). The control unit 21 of the receiving terminal 2 that has received the caller identification information obtains the public key from the root certificate of the root certificate authority stored in the storage unit 27 and uses the public key to obtain the signer's electronic key. Check the validity of the certificate. Next, the signer's public key is obtained from the signer's electronic certificate, the signature information transmitted from the transmission terminal 1 is decrypted, and the hash value transmitted from the transmission terminal 1 is obtained. Further, based on the signature algorithm specified by the electronic certificate, a hash value is calculated from the sender information transmitted from the transmission terminal 1, and compared with the hash value decrypted from the signature information. The sender information transmitted from is authenticated as valid information.

  However, there is a possibility that the caller identification information itself is legitimate, for example, information illegally copied to another medium. Therefore, the receiving terminal 2 transmits a challenge value (for example, a random value) to the transmitting terminal 1 in order to confirm whether or not the caller identification information is illegally copied. The transmitting terminal 1 encrypts the received challenge value with its own private key stored securely, and transmits this to the receiving terminal 2 as a response value. The receiving terminal 2 obtains the public key from the certificate information stored in the storage unit 27, decrypts the response value, compares it with the challenge value transmitted earlier, and if it matches, the caller identification information is illegal. Authenticate that it has not been replicated. The information authenticated by these two processes is displayed on the display unit 23 as the legitimate caller information sent from the legitimate terminal.

In addition, without using the root certificate of the root certificate authority stored in the storage unit 27, the control unit 21 acquires the latest root certificate from the certificate authority 6 via the wireless communication unit 28 every time authentication is performed, This root certificate may be used.
It is also possible to obtain a CRL (Certificate Revocation List) by using communication means and periodically check whether the signer's electronic certificate is currently valid.

  Next, referring to FIG. 2, an overall operation when making a call from the calling terminal 1 to the receiving terminal 2 in the communication system shown in FIG. 1 will be described. First, the control unit 11 of the transmission terminal 1 monitors the operation of the input unit 12 and determines whether or not a transmission operation has been performed (steps S1 and S2). And when transmission operation is performed by the sender | caller, the control part 11 performs a transmission process via the wireless communication part 18 (step S3). On the other hand, the control unit 21 of the receiving terminal 2 monitors incoming calls in the incoming call waiting state, and determines whether or not there is an incoming call (steps S4 and S5). The control unit 21 of the receiving terminal 2 receives an incoming call when there is an incoming call. And the control part 21 transmits a challenge value (random numbers etc.) with respect to a transmission origin (step S6).

  The control unit 11 of the transmission terminal 1 that has performed the transmission process receives the challenge value transmitted from the incoming side after the transmission process (step S7), and obtains a response value from the received challenge (step S8). The response value is obtained by encrypting the received challenge value in the transmission terminal 1 using the secret key stored in the storage unit 17. And the control part 11 reads the sender | caller specific information memorize | stored in the memory | storage part 17, and transmits the read caller specific information and the calculated | required response value to the receiving terminal 2 via the wireless communication part 18 ( Step S9). On the other hand, after transmitting the challenge value, the control unit 21 of the receiving terminal 2 monitors whether the caller specifying information and the response value are transmitted from the calling terminal 1, and sends the caller specifying information via the wireless communication unit 28. And attempt to receive a response value (step S10). And the control part 21 determines whether caller specific information and a response value were able to be received (step S11). When the caller identification information and the response value can be received, the control unit 21 authenticates the validity of the received caller identification information and the response value through the above-described processing operation (step S12), and makes a proper call based on the authentication result. It is determined whether or not the person identification information and the response value (step S13).

  As a result, when it is determined that the caller identification information and the response value are not valid (information that could not be authenticated), the control unit 21 is not valid caller identification information (information that could not be authenticated). This is displayed on the display unit 23 (step S14). On the other hand, if it is legitimate caller specifying information, the control unit 21 displays the received caller specifying information on the display unit 13 (step S15). As a result, while the ringing tone is ringing, the display unit 13 displays information identifying the caller (affiliation name (company name, etc.), name, phone number, etc.). The caller identification information may include an image of the caller's face photo. If it is determined in step S11 that the caller identification information cannot be received, the process skips without performing steps S12 to S15. However, it is also effective to display that the caller identification information has not been received.

  Next, the control unit 21 of the receiving terminal 2 receives a call based on the operation of the input unit 22 (step S16). On the other hand, after transmitting the caller identification information and the response value, the control unit 11 of the calling terminal 1 waits for an incoming call (step S17) and determines whether the incoming call has been received (step S18). And the control part 11 performs a telephone call between the receiving terminals 2 at the time of an incoming call (step S19, S20). Here, the incoming call means a state in which the incoming caller operates a button to make a call when a ringing tone is ringing and makes a call.

  It should be noted that the authentication of the caller identification information and the challenge response authentication may be performed in order, and the order may be first. Further, the caller identification information transmitted by the calling terminal 1 may be stored in the storage unit 27 of the receiving terminal 2 as additional information of the incoming call history, including when authentication fails. In this way, even when an incoming call is not made, the sender information can be recorded, so that the sender information can be confirmed later. Furthermore, when personal authentication data such as voiceprint information is included in the caller information, it is possible to check the falsification of the voiceprint information by authenticating the caller information. It is possible to omit challenge-response authentication because the person can be identified.

  Next, another embodiment of the present invention will be described. So far, the case where the calling terminal and the receiving terminal communicate directly has been explained, but the case where the calling terminal and the receiving terminal are connected via the authentication means (authentication server) of the company to which the caller or the callee belongs. Give an explanation. As shown in FIG. 3, the entire system is such that the certificate authority 6 in FIG. Others are the same as in FIG. The authentication unit 30 may be independently operated without third party authentication, or the authentication unit 30 verifies the attributes of the sender or the caller belonging to the company based on the support of the third party certificate authority. However, in FIG. 3, a third-party certificate authority is omitted.

  A mechanism for connecting the calling terminal 1 and the receiving terminal 2 via the authentication means 30 (authentication server) of the affiliated company to which the caller belongs will be described with reference to FIG. When a call is made from the calling terminal 1 to the receiving terminal 2 which is a customer, first, the address of the authentication means 30 stored in advance by the calling terminal 1 is called (step S30). Since the authentication means 30 securely exchanges the encryption key for authentication / encryption communication with the transmission terminal 1 in advance, for example, the authentication means 30 performs the above-described challenge response authentication (step S31), and the correct transmission terminal Confirm that it is 1. The transmitting terminal 1 sends information (customer number, etc.) of the other party who wants to make a call to the authentication means 30 (step S32), and the authentication means 30 receives it (step S33). The authentication means 30 obtains the telephone number or IP address of the receiving terminal 2 from the customer database or the order slip from the information of the other party who wants to make a call, and sends the search result to the transmitting terminal 1 (step S34). Further, the authentication unit 30 sends the attribute certificate of the caller who is considered to be using the caller terminal 1 to the caller terminal 1 (step S36). The transmitting terminal 1 receives the receiving terminal information and the attribute certificate sent from the authentication unit 30 (step S35 and step S37, respectively).

  The calling terminal 1 that has received the receiving terminal information and the attribute certificate calls the receiving terminal 2 using the received receiving terminal information (step S38). The receiving terminal 2 performs connection processing in response to the call from the transmitting terminal 1 and starts communication (step S39). The transmitting terminal 1 transmits the attribute certificate of the sender, which is communication person identification information, after the receiving terminal 2 starts connection (step S40). The receiving terminal 2 receives the sender's attribute certificate (step S41) and checks the validity of the attribute certificate (step S42). The confirmation method is performed by tracing to the root certificate of the third-party root certificate authority as described above, or as a simple system, the public key of the authentication means 30 of the affiliated company to which the caller who is securely obtained in advance belongs. To do. The receiving terminal 2 determines whether or not the attribute certificate of the caller is valid (step S43), and when it is determined to be valid, the caller information obtained from the attribute certificate or the like is displayed on the display unit 23 of the call receiving terminal 2. If it is determined that it is not valid (step S44), the determination result is displayed on the display unit 23 of the receiving terminal 2 (step S45). If the call is not written in FIG. 4 but does not have the sender's attribute certificate, it is displayed on the display unit 23 of the receiving terminal 2 and the process proceeds to the next step.

  After the result of the validity check of the attribute certificate is displayed on the receiving terminal 2, the receiver determines whether to start a call. When making a call, the call terminal of the receiving terminal 2 indicates the intention of the call. To inform. The receiving terminal 2 senses the call button (step S46), and determines whether or not to start the call (step S47). When a call is to be started, the call start terminal 2 is notified of the start of the call (step S48), and the caller information or the validity judgment result is stored (step S50). If no call is made, the incoming call operation is terminated. Upon receiving the call start notification, the calling terminal 1 starts a call (step S49). When there is no call start notification, the calling terminal 1 ends the call. The calling / incoming procedure basically follows the standard IP telephone connection procedure.

Next, a connection mechanism when a person belonging to a company having the authentication unit 30 is a called party will be described with reference to FIG. In this case, the transmitting terminal 1 first obtains connection information (IP address or the like) to the authentication means 30 of the affiliated company to which the called party as the connection destination belongs. Also, information for determining the validity of the connection destination is obtained. When performing authentication to the third party certificate authority root certificate as described above, the root certificate of the root certificate authority is stored in advance in the calling terminal, but a simple system that eliminates third party authentication. Then, it is only necessary to securely obtain the public key of the authentication means 30 of the affiliated company to which the called party belongs.
As a means for obtaining a valid public key or a valid contact address of the authentication means 30, there is a destination organization of the company to which the recipient belongs or a service handling organization (for example, a convenience store) provided by the company to which the recipient belongs. You can go to a store etc. and get a valid public key or a valid contact address directly. In this case, it is possible to confirm the caller by using an identification card or the like, and register and manage the caller in the database of the authentication means 30 so that a valid transaction can be performed. As another means, by releasing a public key or a valid contact address in commercials by mass media such as television and radio, it is highly possible that a lot of people will check and make correct distribution. Become. Alternatively, a terminal having a correct public key written in advance by a company having the authentication means 30 can be distributed for a fee or free of charge.

  The connection terminal 1 having obtained the connection information of the authentication means 30 (step S60) makes a connection request to the authentication means 30 (step S61). The authentication unit 30 accepts the connection (step S62), and transmits the authentication information that has been digitally signed to prove the authenticity of the authentication unit 30 itself to the transmission terminal 1 (step S63). The transmitting terminal 1 that has received the authentication information of the authentication means 30 (step S64) confirms the validity using the root certificate of the root certificate authority or the public key of the authentication means 30 that is the connection destination (step S65). The transmission terminal 1 determines the validity of the connection destination (step S66), and if it is determined to be valid, displays information on the authentication means 30 that is the connection destination on the display unit 13 of the transmission terminal 1 (step S67). If not, the determination result is displayed on the display unit 13 of the transmission terminal 1 (step S68).

The caller who has confirmed the display on the display unit 13 determines whether or not to continue the connection, and presses the continue button when continuing. The calling terminal 1 senses the continuation button (step S69) and determines whether or not to continue (step S70). When not continuing, operation | movement of the transmission terminal 1 is complete | finished. When continuing, the information for selecting the receiving terminals 2, such as a slip number and a sender's address, is transmitted to the authentication means 30 (step S71). Upon receiving the information for selecting the receiving terminal 2 (step S72), the authentication means 30 determines the person in charge from the slip number based on this information and specifies the terminal of the person in charge or is close to the address of the sender The receiving terminal 2 is selected by searching for the terminal of the person in charge. Then, the connection information is transmitted to the transmitting terminal 1 and the receiving terminal 2 so that the calling terminal 1 and the receiving terminal 2 can safely talk (step S73). The transmitting terminal 1 is transmitted with a connection number such as an IP address of the receiving terminal 2 and an encryption key for making a secure call.
The incoming terminal 2 is called first, and then challenge-response authentication is performed using the encryption key for authentication / encryption communication exchanged with the incoming terminal 2 in advance, so that the incoming terminal 2 is the correct incoming terminal 2. After confirming this, the encryption key for safely calling the information about the transmission terminal 1 or the information about the caller is transmitted. The transmission terminal 1 that has received the connection information (step S74) decrypts the information using the public key of the authentication means 30, and requests a call to the reception terminal 2 (step S76).
On the other hand, the receiving terminal 2 decrypts the connection information (step S75) received from the authenticating means 30 using the encryption key exchanged with the authenticating means 30 in advance, waits for a call from the transmitting terminal 1, receives the call, A caller's attribute certificate or the like, which is stored or received each time communication with the authentication means 30 is performed, is transmitted to the calling terminal 1 to start a call (step S77). The legitimacy determination of the caller identification information received by the calling terminal 1 is performed in the same manner as described above. In addition, the information regarding the calling terminal 1 or the information regarding the caller received by the receiving terminal 2 can be displayed on the display unit 23 of the receiving terminal 2 and utilized to improve the quality of customer service.

  As described above, by using the authentication means 30 installed in the affiliated company to which one of the callers belongs, the transmitting terminal 1 or the receiving terminal 2 used by the person belonging to the company having the authentication means 30 is reused. Even in this case, an attribute certificate having appropriate caller (caller or callee) information can be issued for each call by linking with terminal lending management.

  In the above description of the operation, the calling terminal 1 and the receiving terminal 2 finally make a direct call, but the authentication unit 30 can also relay until the call ends. In this case, the connection procedure is simplified, for example, the distribution of the encryption key used when the calling terminal 1 and the receiving terminal 2 make a direct call can be omitted for a terminal used by a person belonging to a company having the authentication means 30. it can.

  The caller information includes the affiliation name (company name, etc.) and the caller name, etc., and by storing such information, the history list searched with this affiliation name when there is a new call, etc. It is possible to display or display a history list searched by the name of the caller, check the change of the person in charge of this affiliated company, etc. It is also possible to detect the change of the person in charge and display a warning Yes, there are more judgment materials for confirming the legitimacy of the other party.

  Up to now, the affiliation name (company name, etc.), name, telephone number, etc. have been described as the caller information, but the location information of the caller is also effective. Position information can be provided to the receiving terminal by incorporating a positioning system such as GPS in the transmitting terminal. The current location of the caller, or the movement information to date (location information history) can be used to determine whether or not an unnatural action has been taken. Displaying this information on the receiving terminal can also verify the legitimacy of the caller. It becomes a means to raise. In addition, when the caller uses a business vehicle, the caller terminal and the communication means incorporated in the vehicle automatically communicate to send information for identifying the vehicle such as license plate information from the vehicle to the caller terminal. Information is sent as part of the sender information from the calling terminal to the receiving terminal, and the receiving terminal stores the information, so that it is easy to take a countermeasure such as tracking even when a problem occurs. As for the position information, it is also possible to send the position acquired by the GPS loaded on the vehicle instead of the position of the transmitting terminal itself to the receiving terminal via the transmitting terminal.

  As described above, since the caller information that is guaranteed to be legitimate in order to specify the caller is displayed before the call is received (when the ringtone is ringing), this caller identification information is displayed. The person can confirm the displayed caller identification information, and can receive the incoming call with peace of mind. Further, since the caller information is displayed only when the caller identification information is authenticated, it is possible to surely check the caller.

  1 and 3 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read by the computer system and executed to transmit the program. Person information display may be performed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

It is a block diagram which shows the structure of one Embodiment of this invention. 3 is a flowchart illustrating operations of a transmission terminal 1 and a reception terminal 2 illustrated in FIG. 1. It is a block diagram which shows the structure of other embodiment of this invention. It is a flowchart which shows operation | movement of the transmission terminal 1, the receiving terminal 2, and the authentication means 30 shown in FIG. 4 is a flowchart showing another operation of the transmitting terminal 1, the receiving terminal 2 and the authentication means 30 shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Transmission terminal, 11, 21 ... Control part, 12, 22 ... Input part, 13, 23 ... Display part, 14, 24 ... Microphone, 15, 25 ... Speaker 16, 26 ... voice processing unit, 17, 27 ... storage unit, 18, 28 ... wireless communication unit, 3, 4 ... base station, 5 ... mobile communication network, 6 ... Certificate authority, 30 ... Authentication means

Claims (5)

A communication means for making a voice call;
Communicator information storage means for storing communicator specifying information guaranteed to be legitimate for specifying the communicator;
A first communication terminal comprising: a communication person information transmitting means for reading out and transmitting the communication person specifying information stored in the communication person information storage means when transmission is detected by the communication means;
A communication means for making a voice call;
Display means for displaying caller information;
A communication person information authenticating means for authenticating the communication person specifying information;
An information display control means for authenticating the communication person identification information received by the communication person authentication means and displaying the authenticated communication person identification information on the display means when the communication person identification information is received; And a second communication terminal.   The said communication person specific information is the specific information of the caller who transmits communication by the said 1st, 2nd communication terminal, or the specific information of the callee who receives communication, The Claim 1 characterized by the above-mentioned. Communications system.   The communication system according to claim 1, wherein the communication person specifying information includes position information or movement history of transmission of the first communication terminal.   The communication information specifying means is provided in the second communication terminal, and related history information is displayed on the display means in addition to the communication person specifying information at the time of the call. Item 4. The communication system according to Item 3. A communication means for performing a voice call and a first communication terminal including a communication means for performing a voice call and a communication person information storage means for storing a communication person specifying information guaranteed to be valid for specifying a caller And a communication information display method in a communication system comprising a second communication terminal provided with a display means for displaying communication information,
When the first communication terminal detects the start of communication by the communication means, a communication person information transmission step of reading and transmitting the communication person identification information stored in the communication person information storage means;
A communication person information authentication step for authenticating the communication person identification information when the second communication terminal receives the communication person identification information;
The communication information display method, wherein the second communication terminal includes an information display control step for displaying the communication person specifying information that has been authenticated in the communication person authentication step on the display means.

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