1. A face recognition system based on adaptive learning, comprising: a specific person detection and tracking unit for detecting and tracking a specific person from a moving image; a facial feature extraction unit for extracting a plurality of facial feature vectors from the detected and tracked specific person; a face recognition unit for searching for a given registration model by comparing the extracted facial feature vectors with facial feature vectors of the registration models previously stored in a user registration model Database (DB); a learning target selection unit for selecting a facial feature vector to be added to a record of the given registration model from among the extracted facial feature vectors; and a registration model learning unit for adding and updating the selected facial feature vector to the record of the given registration model.