1. A facial image search system, comprising: an image receiving module configured to receive image data; a face detection module configured to detect a facial image from the image data received by the image receiving module; a feature extraction module configured to extract a facial feature from the facial image detected by the face detection module; an attribute discrimination module configured to discriminate an attribute based on the facial feature extracted by the feature extraction module; a plurality of search modules configured to store the facial feature as a database in advance, add the facial feature extracted by the feature extraction module to the database when received, calculate a degree of similarity between the facial feature extracted by the feature extraction module and the facial feature contained in the database, and output a search result based on the calculated degree of similarity; a setting module configured to generate setting information by associating with any attribute with information indicating the search module; and a control module configured to identify one or a plurality of search modules based on the setting information generated by the setting module and the attribute discriminated by the attribute discrimination module and transmit the facial feature extracted by the feature extraction module to the identified search modules.