an input/output circuitry configured to receive biometric information and output a result of registration of the biometric information;

a memory configured to store a program for registering the biometric information; and

a control unit including at least one processor;

wherein the control unit, when receiving a request for registration of the biometric information, forms an artificial neural network in which an encoding network and a feature point extraction network are successively connected to each other by executing the program, applies the biometric information to the artificial neural network as an input, stores an output of the encoding network as converted information and stores an output of the feature point extraction network as a biometric information template;

wherein the converted information is implemented as a multi-dimensional vector value according to a last layer of the encoding network, and is used to renew the biometric information template when the artificial neural network is updated, and

wherein the control unit updates the feature point extraction network, and renews the biometric information template by applying the stored converted information to the updated feature point extraction network as an input.