1. A method for correcting a facial region detected from image data for photoprinting of improved image quality, the method comprising: an image data input step of inputting the image data to an image processing device; a facial region detection step of extracting a skin color region from the inputted image data and detecting a planar face or a rotated planar face from a face-existing candidate region; a region division step of dividing the facial region detected in the facial region detection step; a correction step of extracting a distortion data value from the region divided in the region division step and conducting correction; and a photoprinting step of visually outputting the image data finally corrected in the correction step.