1. A facial image comparing apparatus comprising: fixed-aspect-ratio 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 fixed-aspect-ratio normalizer; variable-aspect-ratio 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 data 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 data 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 variable-aspect-ratio 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 data comparator and said second comparing result calculated by said second data comparator.