Authentication device and authentication method

1. An authentication device that authenticates a user using person specifiable information, the authentication device comprising:

a first storage unit configured to store person specifiable information for each of a plurality of registered users who are registered in advance;

a second storage unit configured to store association information in which the plurality of registered users are associated with a predetermined terminal possessed by the plurality of registered users;

an electronic control unit that is configured to:

acquire person specifiable information from an authentication target user;

acquire identification information that is transmitted from a terminal;

specify a user associated with the terminal transmitting the identification information based on the association information and the identification information;

set an order of the plurality of registered users based on the user specified; and

authenticate the authentication target user by executing a comparison process between the person specifiable information of the authentication target user and the person specifiable information for the plurality of registered users stored in the first storage unit in the order set.

2. The authentication device according to claim 1 , wherein the electronic control unit is configured to authenticate the authentication target user by executing the comparison process between the person specifiable information of the authentication target user and the person specifiable information for the plurality of registered users stored in the first storage unit in the order set by prioritizing the user specified.

3. The authentication device according to claim 1 , wherein the electronic control unit is configured to rewrite the association information when a combination of the authentication target user and the terminal transmitting the identification information is different from a combination of a registered user of the plurality of registered users and the predetermined terminal associated with each other in the association information.

4. The authentication device according to claim 1 , wherein the electronic control unit is configured to present a difference in combination to a user through a predetermined presentation device when a combination of the authentication target user and the terminal transmitting the identification information is different from a combination of a registered user of the plurality of registered users and the predetermined terminal associated with each other in the association information.

5. The authentication device according to claim 1 , wherein the person specifiable information stored in the first storage unit includes biometric information of at least one of face, fingerprint, iris, vein, voiceprint, retina, or DNA.

6. The authentication device according to claim 1 , wherein:

the authentication device is mounted in a vehicle; and

the predetermined terminal is a portable device that is used for operating the vehicle.

7. The authentication device according to claim 1 , wherein:

person specifiable information of a user having a possibility of using the authentication device is registered in the first storage unit; and

association information of a part of users having a predetermined frequency of using the authentication device is registered in the second storage unit.

8. An authentication method executed by an authentication device that authenticates a user using person specifiable information, the authentication device including an electronic control unit that includes a storage unit configured to store person specifiable information for each of a plurality of registered users who are registered in advance and association information in which the plurality of registered users are associated with a predetermined terminal possessed by the plurality of registered users, the authentication method comprising:

by the electronic control unit using the person specifiable information for the plurality of registered users and the association information stored in the storage unit,

acquiring person specifiable information from an authentication target user;

acquiring identification information that is transmitted from a terminal;

specifying a user associated with the terminal transmitting the identification information based on the association information and the identification information;

setting an order of the plurality of registered users based on the user specified; and

authenticating the authentication target user by executing a comparison process between the person specifiable information of the authentication target user and the person specifiable information for the plurality of registered users stored in the storage unit in the order set.

9. A non-transitory storage medium for an authentication device that authenticates a user using person specifiable information, the authentication device including an electronic control unit that includes a storage unit configured to store person specifiable information for each of a plurality of registered users who are registered in advance and association information in which the plurality of registered users are associated with a predetermined terminal possessed by the plurality of registered users, the non-transitory storage medium including control logic executable by a computer processor so that the electronic control unit using the person specifiable information for the plurality of registered users and the association information stored in the storage unit:

acquires person specifiable information from an authentication target user;

acquires identification information that is transmitted from a terminal;

specifies a user associated with the terminal transmitting the identification information based on the association information and the identification information;

sets an order of the plurality of registered users based on the user specified; and

authenticates the authentication target user by executing a comparison process between the person specifiable information of the authentication target user and the person specifiable information for the plurality of registered users stored in the storage unit in the order set.