Abstract: According to another aspect of the inventive concept, there is provided a method of authenticating a user using a plurality of biometric information, the method comprising, receiving an input for setting a security level, receiving first biometric information and second biometric information of a user, and comparing at least one of the first biometric information and the second biometric information which corresponds to the security level with pre-registered reference biometric information and accepting to authenticate the user when a similarity score between the at least one of the first biometric information and the second biometric information and the pre-registered reference biometric information is equal to or greater than a preset reference value.