9. The face recognition system of claim 1 , wherein each of the registration models previously stored in the user registration model DB comprises a plurality of sub-models, facial feature vectors of which have similarities therebetween that are greater than or equal to a threshold.
9. The face recognition system of claim 1 , wherein each of the registration models previously stored in the user registration model DB comprises a plurality of sub-models, facial feature vectors of which have similarities therebetween that are greater than or equal to a threshold. 10. The face recognition system of claim 9 , wherein the registration model learning unit adds the selected facial feature vector to a record of a specific sub-model when similarity between the selected facial feature vector and the facial feature vector of the sub-model is greater than or equal to the threshold, and creates a new sub-model and adds the selected facial feature vector to a record of the new sub-model when the similarity is less than the threshold.