Variable biometric information-based complex authentication system and complex authentication method using the same

A variable biometric information-based complex authentication system comprising:

• a plurality of mobile terminals configured to generate first information regarding an ID that intends to access a facility or second information requiring an access authority, and to collect variable biometric information, such that the first information regarding the 1D and the variable biometric information are stored all together;
• a variable biometric information management server configured to receive the first information regarding the ID and the variable biometric information from the plurality of mobile terminals, and to store the first information regarding the ID and the variable biometric information;
• and
• an agent server configured to, when a mobile terminal requests a login command regarding the ID, compare variable biometric information received from the variable biometric information management server and variable biometric information received from the plurality of mobile terminals, and to verify validity of the login command regarding the ID,
• wherein the agent server is configured to, when first information regarding a specific ID is received from one of the plurality of mobile terminals, set the specific ID to an ID of a first security level which is able to independently access the facility or the second information requiring the access authority, or an ID of a second security level which is able to access the facility or the second information requiring the access authority dependently according to a login state of the ID of the first security level even when validity of the login command regarding the ID is verified,
• wherein the agent server is configured to provide one or more IDs of the second security level that are set to be able to access the facility or the second information requiring the access authority only in a state where the ID of the first security level is logged in,
• wherein the agent server is configured to, when a login command regarding the ID is requested, determine whether the ID requesting the login command is the ID of the first security level or the ID of the second security level, and
• wherein the agent server is configured to, when the ID requesting the login command is the ID of the first security level, verify only validity of the login command regarding the ID of the first security level, and, when the ID requesting the login command is the ID of the second security level, verify validity of the login command regarding the ID of the second security level only in the state where the ID of the first security level, which is set to authenticate in solidarity with the ID of the second security level, is logged in.