A method and a mobile device having a face recognition function using an additional component. The method includes determining whether the face recognition function has been activated in a first state of the mobile device, acquiring an image if the face recognition function has been activated, extracting a facial figure or at least one main component included in the facial figure by analyzing the acquired image, determining whether a face recognized from the image matches a registered user's face based on the facial figure or the at least one main component, determining whether an additional figure recognition function has been activated, extracting an additional figure or at least one additional component included in the additional figure, if the additional figure recognition function has been activated, and switching the mobile device to a predetermined second state corresponding to the additional figure or the at least one additional component.