1. An image processing method for correcting an image, the method comprising: storing an image characteristic amount of an area image in a specific area of a first image of a subject person, wherein the storing comprises storing an image characteristic amount of an area image in a specific area of a first plurality of images of a subject person; and a processor performing the following: adjusting a density and a color tone of an area image in the specific area of a second image of the subject person by using the image characteristic amount of the first image, wherein the adjusting comprises adjusting a density and a color tone of an area image in the specific area of a second image of the subject person by using the image characteristic amount of at least one of said first plurality of images, the at least one of said first plurality of images selected based on a time of day, wherein the time of day comprises at least one of morning and night, wherein said first image and said second image are associated with the subject person based on an identity of the subject person; said image characteristic amount of said first image for adjusting said image characteristic amount of said second image is determined according to said identity of said subject person.