[0001]The present invention relates to a communication terminal, an information
10 processing device, an information processing system, an information processing method,
and a program.
BACKGROUND ART
[0002]
15 As a technology related to voice authentication, for example, Patent Documents
1 and 2 disclose the following technology.
Patent Document 1 discloses a technology for performing authentication by
determining that a user who has produced an utterance for making an outgoing call is a
legitimate user when values of the voice parameters match within a predetermined
20 allowance range. With this technology, it is possible to perform a user authentication
operation corresponding to a change in sound quality of a voice even if a user has an ill body condition.
Patent Document 2 discloses a system that includes a local area wireless
communication device for communicating with a local terminal via a local area wireless
25 communication line, and performs authentication processing using a voice authentication

3 server when voice authentication is required at the local terminal. With this technology,
it is possible to provide a mobile computing environment with higher usability.
[Prior Art Documents]
5 [Patent Documents]
[0003] [Patent Document 1]
Japanese Unexamined Patent Application, First Publication No. 2003-066985
[Patent Document 2]
10 Japanese Unexamined Patent Application, First Publication No. 2001-268646
SUMMARY OF INVENTION
[Problems to be Solved by the Invention]
[0004]
15 Incidentally, in a voice call using a communication terminal, and the like, a
crime such as a request for a transfer of money may occur due to an unauthorized use by
a third party pretending to be an original owner (a subscription contractor) of a
communication terminal. However, the identity verification of a subscription contractor
is only performed at the time of making the subscription contract of the communication
20 terminal using a driver’s license or a health insurance card, and is generally not
performed after that.
Therefore, in a voice call using the communication terminal, it is required to be able to confirm whether a caller making a call is a person assumed by a receiver.
The object of the present invention is to provide a communication terminal, an
25 information processing device, an information processing system, an information

4 processing method, and a program that solve the problems described above.
[Means for Solving the Problems]
[0005]
5 According to one aspect of the present invention, an information processing
system includes a storage means configured to store data related to a voice of a user in association with user identification information that identifies the user, an acquisition means configured to acquire the user identification information on a calling side and data related to the voice of the user on the calling side after a call is started, and a
10 determination means configured to determine whether the data related to the voice of the
user on the calling side acquired by the acquisition means and the data related to the voice stored in the storage means in association with the user identification information acquired by the acquisition means are based on the voice of the same person during the call.
15 [0006]
According to another aspect of the present invention, an information processing method includes storing data related to a voice of a user in association with user identification information that identifies the user, acquiring the user identification information on a calling side and data related to the voice of the user on the calling side
20 after a call is started, and determining whether the data related to the voice of the user on
the calling side acquired in the acquiring step and the data related to the voice stored in the storing step in association with the user identification information acquired in the acquiring step are based on the voice of the same person during the call. [0007]
25 According to still another aspect of the present invention, a program causes a

5 computer to function as a storage means configured to store data related to a voice of a
user in association with user identification information that identifies the user, an
acquisition means configured to acquire the user identification information on a calling
side and data related to the voice of the user on the calling side after a call is started, and
5 a determination means configured to determine whether the data related to the voice of
the user on the calling side acquired by the acquisition means and the data related to the
voice stored by the storage means in association with the user identification information
acquired by the acquisition means are based on the voice of the same person during the
call.
10 [0008]
According to still another aspect of the present invention, an information processing device includes an acquisition means configured to acquire user identification information that identifies a user on a calling side and data related to a voice of the user on the calling side after a call is started, a determination means configured to determine
15 whether data related to the voice of the user on the calling side and data related to the
voice read from a storage means that stores data related to the voice of the user corresponding to the user identification information acquired by the acquisition means are based on the same person during the call. [0009]
20 According to still another aspect of the present invention, a communication
terminal on a receiving side that receives a call from a calling side, includes an output means that, when a result of determining whether data related to a voice of a user on the calling side and data related to the voice of the user on the calling side stored in advance are based on the voice of the same person is received, outputs the result of the
25 determination during the call.

6
[Advantageous Effects of the Invention] [0010]
According to at least one of the aspects described above, it is possible to prevent
5 an unauthorized use of a communication terminal.
BRIEF DESCRIPTION OF DRAWINGS [0011]
FIG. 1 is a diagram which shows an example of a screen flow according to an
10 embodiment.
FIG. 2 is a diagram which shows an example of the screen flow according to the embodiment.
FIG. 3 is a diagram which shows a configuration of an unauthorized use
prevention system according to the embodiment.
15 FIG. 4 is a table which shows an example of data stored by an agency storage
device of the unauthorized use prevention system according to the embodiment.
FIG. 5 is a block diagram which shows a configuration of an information processing system according to the embodiment.
FIG. 6 is a table which shows an example of data acquired by an acquisition unit
20 of the information processing system according to the embodiment.
FIG. 7 is a flowchart which shows an operation of the information processing system according to the embodiment.
FIG. 8 is a flowchart which shows an operation of a calculation unit of the
information processing system according to the embodiment.
25 FIG. 9 is a block diagram which shows a configuration of the information

7 processing system according to the embodiment.
FIG. 10 is a block diagram which shows a basic configuration of the present
invention.
FIG. 11 is a block diagram which shows a configuration of a computer
5 according to at least one embodiment.
EXAMPLE EMBODIMENTS [0012]

10 Hereinafter, a first embodiment of the present invention will be described in
detail with reference to the drawings. [0013]
<>
FIG. 1 is a schematic diagram which represents an example of a screen flow of a
15 mobile communication terminal 24A on a called side according to the first embodiment.
FIG. 1 shows a screen flow displayed by the mobile communication terminal
24A of a called party (a user 21 in FIG. 3). This screen flow is displayed on a display of
the mobile communication terminal 24A by an information processing system 100A
provided in the unauthorized use prevention system 10.
20 [0014]
When a caller (a user 60 in FIG. 3) makes a telephone call to the mobile
communication terminal 24A of the user 21 using a mobile communication terminal 24B
on a calling side, a screen G11 is displayed on the mobile communication terminal 24A
of the user 21. When the user 21 answers the call, a screen G12 is displayed.
25 [0015]

8 When the information processing system 100A of the unauthorized use
prevention system 10 detects an unauthorized use of the user 60, a screen G13 is
displayed and a voice message G14 of the unauthorized use is played. The
unauthorized use is a use of a mobile communication terminal (also referred to as
5 “spoofing”) by a person who is not a contractor (an original owner) who has made a
subscription contract for the mobile communication terminal.
[0016]
In this manner, when spoofing is detected during a call by the information
processing system 100A, the mobile communication terminal 24A on a called side
10 displays a result of the detection.
As a result, a receiver can confirm whether a caller is a person assumed by a
receiving side (a subscription contractor of the mobile communication terminal 24B on a
calling side) even during a call. For this reason, spoofing can be prevented.
[0017]
15 FIG. 2 is a schematic view which shows an example of a screen flow of the
mobile communication terminal 24B on the calling side according to the first
embodiment.
FIG. 2 is a screen flow displayed by the mobile communication terminal 24B of
the user 60 in FIG. 3. This screen flow is displayed on a display of the mobile
20 communication terminal 24B by the information processing system 100 provided in the
unauthorized use prevention system 10.
[0018]
When the user 60 in FIG. 3 makes a telephone call to the mobile communication
terminal 24A of the user 21 using the mobile communication terminal 24B, a screen G15
25 is displayed on the mobile communication terminal 24B of the user 60. When the user

9 21 answers the call, a screen G16 is displayed.
[0019]
When the information processing system 100 of the unauthorized use prevention
system 10 detects an unauthorized use of the user 60, a screen G17 is displayed and a
5 voice message G18 of the unauthorized use is played.
[0020]
<>
FIG. 3 is a diagram which shows a configuration of the unauthorized use
prevention system 10 according to the first embodiment. The unauthorized use
10 prevention system 10 includes a microphone 22A provided in an agency 20 of a
communication company A, an agency storage device 23A, and an agency processing
device 25A. In addition, the unauthorized use prevention system 10 includes a
microphone 22B provided in an agency 30 of a communication company B, an agency
storage device 23B, and an agency processing device 25B. Moreover, the unauthorized
15 use prevention system 10 includes a mobile communication terminal 24A of the
communication company A used by the user 21 and the mobile communication terminal
24B of the communication company B used by the user 60. Furthermore, the
unauthorized use prevention system 10 includes a network 41 of the communication
company A and an information processing system 100A connected to the network 41, and
20 a network 51 of the communication company B and an information processing system
100B connected to the network 51.
[0021]
Microphones 22A and 22B are devices that receive human voices.
Agency storage devices 23A and 23B are devices that store user identification
25 information and voiceprints of users who make subscription contracts for mobile

10 communication terminals at the agencies, and include, for examples, hard disks. The
user identification information is information that identifies a user at the time of
transmitting or receiving a telephone call, and includes, for example, a carrier type and a
telephone number with which a user makes a subscription contract, and a unique number
5 of the user. A carrier type is a communication company with which the user has made a
subscription contract.
[0022]
FIG. 4 is a table which shows an example of data stored by the agency storage
devices 23A and 23B. As shown in FIG. 4, the agency storage devices 23A and 23B
10 store a telephone number contracted by a contractor, a carrier contracted by a contractor,
and voice data of each subscription contractor. Voice data is stored in a column of the
voice data of a contractor in a third column in FIG. 4.
[0023]
The mobile communication terminals 24A and 24B are communication
15 terminals whose one side or both sides can move. The mobile communication terminals
are examples of a communication terminal. Examples of the mobile communication
terminals 24A and 24B include smartphones, tablets, tablets with a telephone function, or
Internet of Things (IoT) devices having a telephone function.
The agency processing devices 25A and 25B receive user identification
20 information and voice data from the microphones 22A and 22B, and store them in the
agency storage devices 23A and 23B.
[0024]
The user 21 visits the agency 20 of the communication company A and makes a
subscription contract for the mobile communication terminal 24A of the communication
25 company A. At the time of this contract, the agency 20 uses the microphone 22A to

11 collect a voice of the user 21 and receive it as voice (voiceprint) data. After that, the
agency 20 sets a carrier type and a telephone number of the mobile communication
terminal 24A contracted by the user 21 as user identification information of the user 21
by using the agency processing device 25A. The agency processing device 25A causes
5 the agency storage device 23A to store the voice (voiceprint) data received from the user
21 in association with the user identification information of the user 21.
[0025]
On the other hand, the user 31 visits the agency 30 of the communication
company B and makes a subscription contract for the mobile communication terminal
10 24B of the communication company B. At the time of this contract, the agency 30 uses
the microphone 22B to collect a voice of the user 31 and receive it as voice (voiceprint) data. After that, the agency 30 uses the agency processing device 25B to set a carrier type and a telephone number of the mobile communication terminal 24B contracted by the user 31 as user identification information of the user 31. The agency processing
15 device 25B causes an agency storage device 23B to store the voice (voiceprint) data
received from the user 31 in association with the user identification information of the
user 31.
[0026]
<>
20 FIG. 5 is a schematic block diagram which shows a configuration of the
information processing systems 100A and 100B. The information processing systems 100A and 100B include storage units 110A and 110B, acquisition units 120A and 120B, selection units 130A and 130B, determination units 140A and 140B, output units 150A and 150B, function restriction units 160A and 160B, abnormal information storage units
25 170A and 170B, and calculation units 180A and 180B, respectively.

12 [0027]
The storage units 110A and 110B store voiceprint data (an example of “data
related to a voice”) of a user for each item of user identification information. For
example, the storage unit 110A of the information processing system 100A of a network
5 41 in FIG. 3 stores user identification information stored by the agency storage device
23A provided in the agency 20, and the voiceprint data for each item of user
identification information in association with the user identification information. The
storage unit 110B of the information processing system 100B of a network 51 in FIG. 3
stores user identification information stored by the agency storage device 23B provided
10 in the agency 30, and the voiceprint data for each item of user identification information
in association with the user identification information.
Voiceprint data is, for example, data that represents a voiceprint and data that
represents a feature amount of a voice of a speaker. However, the voiceprint data is not
limited to this, and may also be voice data other than a voiceprint, or data that is a
15 combination of a voice and an image.
[0028]
The acquisition units 120A and 120B acquire user identification information of a
communication terminal on a calling side and data related to a voice of a caller after a
call is started.
20 FIG. 6 is a diagram which shows an example of data acquired by the acquisition
units 120A and 120B.
[0029]
For example, the acquisition unit 120A of the information processing system
100A of the network 41 in FIG. 3 acquires a carrier type and a telephone number of the
25 mobile communication terminal 24B, which are user identification information of the

13 mobile communication terminal 24B on a calling side, and call voice data (an example of
“data related to a voice”) of the user 60 after a call between the user 60 and the user 21 is
started. Call voice data is data that represents a voice during a call.
In addition, the acquisition unit 120B of the information processing system
5 100B of the network 51 in FIG. 3 acquires the carrier type and the telephone number of
the mobile communication terminal 24B, which are the user identification information of
the mobile communication terminal 24B on the calling side, and voiceprint data related
to the voice of the user 60 recorded in the storage unit 110B corresponding to the user
identification information after the call between the user 60 and the user 21 is started.
10 [0030]
The selection unit 130A selects whether the determination unit 140A performs a determination after the call is started. The determination involves determining whether the call voice data of the user 60 on the calling side of the call and the voiceprint data stored by the storage unit 110B in association with the user identification information of
15 the communication terminal 24B on the calling side are based on the voice of the same
person.
For example, the selection unit 130A of the information processing system 100A of network 41 and the selection unit 130B of the information processing system 100B of network 51 in FIG. 3 randomly select whether the determination units 140A and 140B
20 perform the determination. When the selection units 130A and 130B select to perform
the determination, the determination units 140A and 140B perform the determination. On the other hand, when the selection units 130A and 130B select not to perform the determination, the determination units 140A and 140B do not perform the determination. [0031]
25 When the selection units 130A and 130B select to perform the determination, the

14 determination units 140A and 140B determine whether the call voice data of the user on
the calling side of the call and the voiceprint data stored by the storage unit 110 in
association with the user identification information related to the calling side of the call
in the user identification information acquired by the acquisition units 120A and 120B
5 during the call are based on the voice of the same person.
[0032]
For example, in the example of FIG. 3, when the selection unit 130A selects to
perform the determination, the determination unit 140A uses the voice data of the user 60
acquired by the acquisition unit 120A as a collation target. In addition, the
10 determination unit 140A uses the voice (voiceprint) data of the user 31 stored by the
storage unit 110B in association with the user identification information of the mobile communication terminal 24B acquired by the acquisition unit 120B as another collation target. [0033]
15 That is, in this collation, the call voice data of the user 60 and the voiceprint data
of the user 31 are collated. A known voice collation method is used for this collation. [0034]
After the collation described above, for example, in the example shown in FIG. 3, the determination unit 140A compares the voiceprint of the user 31 with the voiceprint
20 extracted from the call voice data of the user 60. As a result, the determination unit
140A determines whether the voiceprint data of the user 31 and the call voice data of the user 60 are based on the voice of the same person. In the example shown in FIG. 3, since the voiceprint of the user 31 and the voiceprint extracted from the call voice data of the user 60 do not match, the determination unit 140A determines that the user 31 and the
25 user 60 are not the same person. That is, the determination unit 140A determines that

15 the user 60 is using the communication terminal 24B without authorization.
The determination unit 140A of the information processing system 100A does
not perform the determination described above when the selection unit 130A selects not
to perform the determination.
5 [0035]
On the other hand, the determination unit 140B of the information processing
system 100B of the network 51 acquires the carrier type and the telephone number
related to the mobile communication terminal 24B acquired by the acquisition unit 120B,
and the call voice data of the user 60.
10 [0036]
After that, the determination unit 140B collates the call voice data of the user 60
with voiceprint data corresponding to the user identification information (the carrier type
and the telephone number) of the mobile communication terminal 24B stored by the
storage unit 110B. As a result of this collation, in the example of FIG. 3, the
15 determination unit 140B determines whether the user 31 and the user 60 are the same
person.
On the other hand, the determination unit 140B of the information processing
system 100B does not perform the determination described above when the selection unit
130B selects not to perform the determination.
20 [0037]
The output units 150A and 150B output results of the determination by the
determination units 140A and 140B, respectively. For example, since it is determined
by the determination units 140A and 140B that the user 31 and the user 60 are not the
same person, the output unit 150A of the information processing system 100A of the
25 network 41 and the output unit 150B of the information processing system 100B of the

16 network 51 output a result of the determination.
Here, the output unit 150A notifies the mobile communication terminal 24A on a
receiving side of the result of the determination, and outputs the result to an output unit
of the mobile communication terminal 24A on the receiving side. The output unit of the
5 mobile communication terminal 24A is, for example, a display, a vibrator that generates
vibration, and a speaker that generates a voice. The output units 150A and 150B may
output a result of the determination for each carrier type, and in this case, may also
transmit the result of the determination to a communication company for each carrier
type.
10 [0038]
When the results of the determination by the determination units 140A and 140B
are that the call voice data of the user on the calling side and the voiceprint data stored by
the storage unit 110A or 110B are not based on the voice of the same person, the function
restriction units 160A and 160B restrict functions of devices on the calling side.
15 [0039]
Examples of these devices include mobile communication terminals and fixed
line telephones, which are communication terminals on the calling side related to
determination. Examples of the restricted functions include an incoming call function
and an outgoing call function. Examples of a function restriction timing include
20 immediately after the determination described above and immediately after an end of the
call according to the determination described above.
For example, in the example shown in FIG. 3, in the function restriction unit
160B of the information processing system 100B, the determination unit 140B
determines that the user 31 who is a subscription contractor of the mobile communication
25 terminal 24B and the user 60 are not the same person. For this reason, the function

17 restriction unit 160B restricts the outgoing call function of the mobile communication
terminal 24B immediately after the call according to this determination.
[0040]
When each result of the determination by the determination units 140A and
5 140B is that the call voice data of the user on the calling side and the voiceprint data
stored by the storage unit 110A or 110B are not based on the voice of the same person,
the abnormal information storage units 170A and 170B store the call voice data on the
calling side.
For example, in the example shown in FIG. 3, the abnormal information storage
10 unit 170B of the information processing system 100B stores the call voice data of the
user 60 on the calling side immediately after the determination unit 140B determines that
the user 31 and the user 60 are not the same person.
[0041]
The calculation units 180A and 180B calculate the amount of money to be
15 charged to a user according to the number of determinations by the determination units
140A and 140B in a certain period of time, respectively.
For example, in the example shown in FIG. 3, the determination unit 140A of
the information processing system 100A performs ten determinations on the mobile
communication terminal 24A of the user 21 in a certain period of time, and calculates
20 100 yen as the amount of money to be charged to the user 21 when the amount of money
to be charged for each determination is 10 yen.
The amount of money to be charged by the calculation units 180A and 180B
may be calculated according to the result of the determination as well as the number of
determinations. For example, when there are ten determinations in a certain period of
25 time and the determination units 140A and 140B perform determination once out of the

18 ten times that there is an unauthorized use, the amount of money to be charged for each
determination can be set to 10 yen and the amount of money to be charged for each
determination of an unauthorized use can be set to 1000 Yen. In this case, the
calculation unit 180 calculates 1100 yen as the amount of money to be charged to a user.
5 The calculation units 180A and 180B may calculate the amount of money to be
charged to communication companies or groups for each carrier type of communication
company or for each group made of a plurality of communication companies. In this
case, the calculation units 180A and 180B add up the amount of money for each carrier
type or for each carrier type of a plurality of communication companies belonging to a
10 group or the like.
[0042]
In the example shown in FIG. 3, the user 60 is making a call to the user 21 by using the mobile communication terminal 24B with which the user 31 has made a subscription contract without authorization.
15 Since the mobile communication terminal 24B that is used by the user 60
without authorization is a communication terminal of the communication company B, the network 51 of the communication company B is used to be linked with the network 41 of the communication company A. That is, the mobile communication terminal 24B that is used by the user 60 without authorization is linked with the mobile communication
20 terminal 24A of the user 21 through the network 41.
[0043]
<>
In the following description, operations of the information processing systems 100A and 110B will be described with reference to FIG. 7.
25 FIG. 7 is a flowchart which shows the operations of the information processing

19 systems 100A and 110B according to the first embodiment. The information processing
systems 100A and 110B perform the operations shown in FIG. 7 for each call.
[0044]
In step S1, the selection units 130A and 130B randomly select, for example,
5 whether the determination units 140A and 140B perform a determination after a call is
started.
When the selection units 130A and 130B select not to perform a determination
(NO in step S1), the operations of the information processing systems 100A and 100B in
the call end.
10 [0045]
On the other hand, when the selection units 130A and 130B select to perform a
determination (YES in step S1), the acquisition units 120A and 120B acquire the user
identification information and the call voice data on the calling side (step S2).
The determination units 140A and 140B collate the calling voice data on the
15 calling side with the voiceprint data stored by the storage units 110A and 110B on the
basis of the data acquired by the acquisition units 120A and 120B in step S2 (step S3).
[0046]
In step S3, when a result of the determination by the determination units 140A
and 140B is that the users related to the collation in step S3 are the same person (YES in
20 step S4), the operations of the information processing systems 100A and 100B in the call
end.
On the other hand, when a result of the determination by the determination units
140A and 140B in step S3 is that the users related to the collation in step S3 are not the
same person (NO in step S4), the output units 150A and 150B output the result of the
25 determination in step S3 (step S5).

20 [0047]
The abnormal information storage units 170A and 170B store the call voice data
on the calling side (step S6).
The function restriction units 160A and 160B restrict functions of devices on the
5 calling side (step S7).
[0048]
FIG. 8 is a flowchart which shows operations of the calculation units 180A and
180B of the information processing systems 100A and 100B according to the first
embodiment. The calculation units 180A and 180B perform the operation according to
10 FIG. 8 for each period set in advance.
[0049]
In step S9, the calculation units 180A and 180B acquire the number of
determinations by the determination units 140A and 140B during the period set in
advance.
15 The calculation units 180A and 180B multiply the number of determinations
acquired in step S9 by the amount of money per time (step S10).
[0050]
In step S11, the calculation units 180A and 180B acquire the number of
determinations as an unauthorized use by the determination units 140A and 140B during
20 the period set in advance.
The calculation units 180A and 180B multiply the number of determinations
acquired in step S11 by the amount of money per time (step S12).
The calculation units 180A and 180B add step S10 and step S12 to calculate the
amount of money (step S13).
25 [0051]

21 << Advantageous Effect>>
As described above, according to the first embodiment, the information
processing systems 100A and 100B include the storage units 110A and 110B that store
the voiceprint data for each item of user identification information, and the acquisition
5 units 120A and 120B that acquire the user identification information on the calling side
and the call voice data of the user on the calling side after a call is started. In addition,
the information processing systems 100A and 100B include the determination units 140A
and 140B that determine whether the call voice data of the user on the calling side and
the voiceprint data stored by the storage unit 110A or 110B are based on the voice of the
10 same person for the user identification information acquired by the acquisition units
120A and 120B during the call. As a result, the information processing systems 100A
and 100B can allow a business operator to easily detect an unauthorized use.
[0052]
According to the first embodiment, the information processing systems 100A
15 and 100B include the selection units 130A and 130B that randomly select, for example,
whether the determination units 140A and 140B perform a determination after a call is started. Moreover, the determination units 140A and 140B of the information processing systems 100A and 100B perform a determination when the selection units 130A and 130B select that they perform a determination. As a result, the information
20 processing systems 100A and 100B can reduce a burden on the system due to a
determination performed every time while suppressing an unauthorized use by a determination. [0053]
According to the first embodiment, the information processing systems 100A
25 and 100B include the output units 150A and 150B that output results of the determination

22 by the determination units 140A and 140B. As a result, the information processing
systems 100A and 100B can provide a user with information on an unauthorized use of a
communication terminal, and reduce a damage caused by the unauthorized use by
suppressing the unauthorized use.
5 [0054]
According to the first embodiment, the information processing systems 100A
and 100B include the function restriction units 160A and 160B that restrict the functions
of the devices on the calling side when the results of the determination by the
determination units 140A and 140B are that the voiceprint data of the user on the calling
10 side and the voiceprint data stored by the storage unit 110A or 110B are not based on the
voice of the same person. As a result, the information processing systems 100A and 100B can restrict a use of a communication terminal according to an unauthorized use, and can prevent the unauthorized use after the restriction. [0055]
15 According to the first embodiment, the information processing systems 100A
and 100B include the abnormal information storage units 170A and 170B that store the call voice data on the calling side when the results of the determination by the determination units 140A and 140B are that the call voice data of the user on the calling side and the voiceprint data stored by the storage unit 110A or 110B are not based on the
20 voice of the same person. As a result, the information processing systems 100A and
100B can store abnormal information due to the unauthorized use of a communication terminal, and can suppress the unauthorized use by providing an evidence of the unauthorized use to national institutions, and the like. [0056]
25

23 <>
In the following description, an information processing system 100C according
to a second embodiment will be described with reference to the drawings.
FIG. 9 is a schematic block diagram which shows a configuration of the
5 information processing system 100C according to the second embodiment. The
configuration of the information processing system 100C according to the second
embodiment is a configuration in which a voice storage unit 190C is added to the
configurations of the information processing systems 100A and 100B according to the
first embodiment. Since the information processing system 100C according to the
10 second embodiment includes the voice storage unit 190C, an unauthorized use can be
prevented by the determination unit 140C performing a determination on a
communication terminal, which is more likely to be used without authorization.
[0057]
The voice storage unit 190C stores the call voice data on the calling side. For
15 example, the voice storage unit 190C stores not only the call voice data in a call between
the user 21 and the user 60 in FIG. 3, but also the call voice data on the calling side in all
the calls via the network 41 in a certain period of time.
[0058]
A selection unit 130C selects whether the determination unit 140C performs a
20 determination after a call is started on the basis of the call voice data stored by the voice
storage unit 190C and data set in advance.
[0059]
For example, the voice storage unit 190C stores the call voice data on the calling
side in all the calls via the network 41 in a certain period of time.
25 The selection unit 130C analyzes a voice of the call voice data stored by the

24 voice storage unit 190C and generates a sentence representing the voice. When a
keyword of “transfer” is set in advance, the selection unit 130C extracts call voice data in
which the keyword appears from the generated sentence. The voice storage unit 190C
selects a mobile communication terminal of user identification information
5 corresponding to the extracted call voice data. Here, the voice storage unit 190C may
select a mobile communication terminal having a large number of selected call voice
data.
[0060]
<>
10 As described above, according to the second embodiment, the information
processing system 100C includes the voice storage unit 190C that stores the call voice data of the user on the calling side, and includes a selection unit 130C that selects whether the determination unit 140C performs a determination after a call is started on the basis of the call voice data stored by the voice storage unit 190C and the data set in
15 advance. As a result, the information processing system 100C can prevent an
unauthorized use by the determination unit 140C performing a determination on a
communication terminal, which is more likely to be used without authorization.
[0061]

20 Although one embodiment has been described in detail with reference to the
drawings, a specific configuration is not limited to the description above, and various design changes and the like can be made.
For example, in the example of the embodiment described above, the configuration is configured by the mobile communication terminals 24A and 24B, but
25 may also be configured by a fixed telephone having a telephone function and an IoT

25 device instead of the mobile communication terminals. In addition, the selection units
130A to 130C may select that the determination units 140A to 140C perform a
determination when a call is made from a telephone number set by a user.
[0062]
5 <>
FIG. 10 is a schematic block diagram which shows a basic configuration of the
information processing system 100 of the present invention.
The information processing system 100 related to the basic configuration
includes a storage unit 110, an acquisition unit 120, and a determination unit 140.
10 [0063]
The information processing system 100 according to a basic configuration
includes the storage unit 110 that stores data related to a voice for each item of user
identification information, and the acquisition unit 120 that acquires the user
identification information on the calling side and data related to a voice of the user on the
15 calling side after a call is started. Moreover, the information processing system 100
includes the determination unit 140 that determines whether the data related to the voice
of the user on the calling side and the data related to a voice stored in the storage unit 110
are based on the voice of the same person for the user identification information acquired
by the acquisition unit 120 during the call. As a result, the information processing
20 system 100 can allow a business operator to easily detect an unauthorized use.
[0064]
FIG. 11 is a schematic block diagram which shows a configuration of a
computer according to at least one embodiment.
A computer 1100 includes a processor 1110, a main memory 1120, a storage
25 1130, and an interface 1140.

26 The information processing system 100 described above, an agency storage
device 23, and an agency processing device 25 are implemented in a computer 1100.
Then, an operation of each processing unit described above is stored in the storage 1130
in a form of a program. The processor 1110 reads a program from the storage 1130,
5 expands it into a main memory 1120, and executes the processing described above
according to the program. In addition, the processor 1110 secures a storage area
corresponding to each of the storage units described above in the main memory 1120
according to the program.
[0065]
10 The program may be a program for realizing a part of functions to be exerted by
the computer 1100. For example, the program may exert the functions in combination with another program already stored in the storage 1130, or in combination with another program implemented in another device. In another embodiment, the computer 1100 may include a custom large scale integrated circuit (LSI) such as a programmable logic
15 device (PLD) in addition to or in place of the configuration described above. Examples
of the PLD include a programmable array logic (PAD), a generic array logic (GAL), a complex programmable logic device (CPLD), and a field programmable gate array (FPGA). In this case, some or all of the functions realized by the processor 1110 may be realized by a corresponding integrated circuit.
20 [0066]
Examples of the storage 1130 include magnetic disks, magneto-optical discs, semiconductor memories, and the like. The storage 1130 may be an internal media directly connected to a bus of the computer 1100, or may also be an external media connected to the computer via the interface 1140 or a communication line. Moreover,
25 when this program is distributed to the computer 1100 by the communication line, the

27 computer 1100 that has received the distribution may expand the program to the main
memory 1120 and execute the processing described above. In at least one embodiment,
the storage 1130 is a non-temporary tangible storage medium.
[0067]
5 In addition, the program may be a program for realizing a part of the functions
described above. Furthermore, the program may be a so-called difference file (a
difference program) that realizes the functions described above in combination with
another program already stored in the storage 1130.
[0068]
10 Priority is claimed on Japanese Patent Application No. 2019-107903, filed June
10, 2019, the content of which is incorporated herein by reference.

15
20
25

[Reference Symbols List]
[0069]
10 Unauthorized use prevention system
20 Agency
21 User
22 Microphone
23 Agency storage device
24 Mobile communication terminal
25 Agency processing device
30 Agency
31 User
41 Network
51 Network

28

60 User
100 Information processing system
110 Storage unit
120 Acquisition unit
130 Selection unit
140 Determination unit
150 Output unit
160 Function restriction unit
170 Abnormal information storage unit
180 Calculation unit
190 Voice storage unit
1100 Computer
1110 Processor
1120 Main memory
1130 Storage
1140 Interface

WE CLAIMS

An information processing system comprising:
a storage means configured to store data related to a voice of a user in
5 association with user identification information that identifies the user;
an acquisition means configured to acquire the user identification information on
a calling side and data related to the voice of the user on the calling side after a call is
started; and
a determination means configured to determine whether the data related to the
10 voice of the user on the calling side acquired by the acquisition means and the data
related to the voice stored in the storage means in association with the user identification
information acquired by the acquisition means are based on the voice of the same person
during the call.
15 2. The information processing system according to claim 1, further comprising:
a selection means configured to randomly select whether to perform the determination,
wherein, when the selection means selects to perform a determination, the determination means performs the determination. 20
3. The information processing system according to claim 1, further comprising:
a voice storage means configured to store data related to the voice of the user on the calling side; and
a selection means configured to select whether or not to perform the
25 determination on the basis of the data related to the voice stored by the voice storage

30 means and data set in advance after a call is started.
4. The information processing system according to any one of claims 1 to 3, further
comprising an output means configured to output a result of the determination to a
5 communication terminal on a receiving side.
5. The information processing system according to any one of claims 1 to 4, further
comprising a function restriction means configured to restrict a communication function
of a communication terminal on the calling side when the result of the determination is
10 that the data related to the voice of the user on the calling side and the data related to the
voice stored by the storage means are not based on the voice of the same person.
6. The information processing system according to any one of claims 1 to 5, further
comprising an abnormal information storage means configured to store the data related to
15 the voice of the user on the calling side when the result of the determination is that the
data related to the voice of the user on the calling side and the data related to the voice stored by the storage means are not based on the voice of the same person.
7. An information processing method comprising:
20 storing data related to a voice of a user in association with user identification
information that identifies the user;
acquiring the user identification information on a calling side and data related to the voice of the user on the calling side after a call is started; and
determining whether the data related to the voice of the user on the calling side
25 acquired in the acquiring step and the data related to the voice stored in the storing step in

31 association with the user identification information acquired in the acquiring step are
based on the voice of the same person during the call.
8. A program which causes a computer to function as
5 a storage means configured to store data related to a voice of a user in
association with user identification information that identifies the user,
an acquisition means configured to acquire the user identification information on a calling side and data related to the voice of the user on the calling side after a call is started, and
10 a determination means configured to determine whether the data related to the
voice of the user on the calling side acquired by the acquisition means and the data related to the voice stored by the storage means in association with the user identification information acquired by the acquisition means are based on the voice of the same person during the call.
15
9. An information processing device comprising:
an acquisition means configured to acquire user identification information that identifies a user on a calling side and data related to a voice of the user on the calling side after a call is started; and
20 a determination means configured to determine whether data related to the voice
of the user on the calling side and data related to a voice read from a storage means that stores data related to the voice of the user corresponding to the user identification information acquired by the acquisition means are based on the same person during the call.
25

32
10. A communication terminal on a called side that receives a call from a calling
side, wherein, when a result of determining whether data related to a voice of a user on
the calling side and data related to the voice of the user on the calling side stored in
advance are based on the voice of the same person is received, the result of the
5 determination is output during the call.