FRAUD ESTIMATION SYSTEM, FRAUD ESTIMATION METHOD AND PROGRAM

1 : A fraud estimation system, comprising at least one processor configured to:

store a learning model that has learned a relationship between a comparison result that is a result of comparing user information of a user in one service to user information of a fraudulent user or an authentic user in another service and presence or absence of fraudulence in the one service;

obtain a comparison result that is a result of comparing user information of a target user in the one service and user information of a fraudulent user or an authentic user in the another service;

obtain output from the learning model based on the comparison result; and

estimate fraudulence of the target user based on the output from the learning model.

2 : The fraud estimation system according to claim 1 ,

wherein the learning model has learned a relationship between a plurality of comparison results respectively corresponding to a plurality of other services and the presence or absence of fraudulence in the one service,

wherein the at least one processor is configured to obtain a plurality of comparison results respectively corresponding to the plurality of other services, and

wherein the at least one processor is configured to obtain output from the learning model based on the plurality of comparison results.

3 : The fraud estimation system according to claim 1 ,

wherein the learning model has further learned a relationship between a utilization situation in the one service and the presence or absence of fraudulence in the one service,

wherein the at least one processor is configured to obtain a utilization situation of the one service by the target user, and

wherein the at least one processor is configured to obtain output from the learning model based on the utilization situation by the target user.

4 : The fraud estimation system according to claim 3 ,

wherein, in the one service, fraudulence is estimated based on user information of a predetermined item, and

wherein the utilization situation is a utilization situation about the predetermined item.

5 : The fraud estimation system according to claim 1 ,

wherein, in the one service and the another service each, a plurality of items of user information are registered,

wherein the learning model has learned relationships between a plurality of comparison results respectively corresponding to the plurality of items and the presence or absence of fraudulence in the one service,

wherein the at least one processor is configured to obtain a plurality of comparison results respectively corresponding to the plurality of items, and

wherein the at least one processor is configured to obtain output from the learning model based on the plurality of comparison results.

6 : The fraud estimation system according to claim 1 ,

wherein, in the another service, fraudulence is estimated based on user information of a predetermined item,

wherein the learning model has learned a relationship between a comparison result of user information of the predetermined item and the presence or absence of fraudulence in the one service, and

wherein the at least one processor is configured to obtain a comparison result of the predetermined item.

7 : The fraud estimation system according to claim 1 ,

wherein, in the another service, fraudulence is estimated based on user information of a first item,

wherein the learning model has learned a relationship between a comparison result of user information of a second item and the presence or absence of fraudulence in the one service, and

wherein the at least one processor is configured to obtain a comparison result of the second item.

8 : The fraud estimation system according to claim 1 ,

wherein, in the another service, user information of the target user in the one service and user information of a fraudulent user or an authentic user in the another service are compared, and

wherein the at least one processor is configured to obtain a result of the comparison from the another service.

9 : The fraud estimation system according to claim 1 , wherein the at least one processor is configured to receive a utilization request that is a request for use of the one service by the target user, and

wherein the at least one processor is configured to estimate fraudulence of the target user when the one service is used by the target user.

10 : A fraud estimation method, comprising:

obtaining a comparison result that is a result of comparing user information of a target user in one service and user information of a fraudulent user or an authentic user in another service;

obtaining output from a learning model based on the comparison result, the learning model having learned a relationship between a comparison result that is a result of comparing user information of a user in the one service to user information of a fraudulent user or an authentic user in the another service and presence or absence of fraudulence in the one service; and

estimating fraudulence of the target user based on output from the learning model.

11 : A non-transitory computer-readable information storage medium for storing a program for causing a computer to:

obtain a comparison result that is a result of comparing user information of a target user in one service and user information of a fraudulent user or an authentic user in another service;

obtain output from a learning model based on the comparison result, the learning model having learned a relationship between a comparison result that is a result of comparing user information of a user in the one service to user information of a fraudulent user or an authentic user in the another service and presence or absence of fraudulence in the one service; and

estimate fraudulence of the target user based on output from the learning model.