Abstract: A multi-functional authentication apparatus and an operation method for the same are provided. The multi-functional authentication apparatus integrates multiple communication modules into one device. A biometric authentication procedure is firstly performed when activating this multi-functional authentication apparatus. A security code is generated through a security authentication mechanism provided by this apparatus after reading biometric features. After that, according to a connection protocol, one of the communication modules of the multi-functional authentication apparatus is activated to connect with an external host. The security code is transmitted to the host via the communication module for identifying a user. The multi-functional authentication apparatus acts as an authenticator that allows a user to login to a computer system or obtain a network service after authentication.