1. A streaked pattern image analyzing method for aiding in identification as to whether or not a first streaked pattern image matches a second streaked pattern image, said method comprising the steps of: modifying data on one of the first streaked pattern image and the second streaked pattern image such that a point on a first streaked pattern image which resides on a skeleton thinned from a streak of the streaked pattern image and having a corresponding point on the second streaked pattern image is brought closer to a point on a skeleton of the second streaked pattern image corresponding to said point; and delivering the modified streaked pattern image and the other streaked pattern image.