1. A facial image comparing apparatus comprising: first normalizer that generates a first normalized image by performing a normalizing process with fixed aspect ratios on given facial images; feature extractor that generates feature images including features to be used for comparing faces, from said first normalized image generated by said first normalizer; second normalizer that generates a second normalized image by performing a normalizing process with variable aspect ratios on said feature images generated by said feature extractor; first comparator that calculates a first comparing result as an index as to whether or not faces in two images belong to one person, using said feature images generated by said feature extractor; second comparator that calculates a second comparing result as an index as to whether or not the faces in the two images belong to one person, using said second normalized image generated by said second normalizer; and judging section that judges whether or not the faces in the two images belong to one person, based on said first comparing result calculated by said first comparator and said second comparing result calculated by said second comparator.