1. A person recognizing apparatus, comprising: a feature pattern extracting means for extracting a feature pattern obtainable from a person to be recognized; a recognition information calculating means for calculating recognition information containing at least a subspace from the calculation amount extracted by said feature pattern extracting means; a registered information holding means for holding multiple recognition information as registered recognition information; a recognizing means for recognizing the person by using recognition information calculated by said recognition information calculating means or a feature pattern extracted by said feature pattern extracting means and the registered recognition information held in said registered information holding means; a registered information updating means for updating the registered recognition information concerning the person held in said registered information holding means by using the recognition information calculated by said recognition information calculating means or the feature pattern extracted by said feature pattern extracting means.