1. A computer-based method for organizing digital photos, comprising: extracting one or a plurality of faces from a first digital photo in a first group; generating a cropped image having corresponding single face of individual faces cropped out from said first digital photo; displaying said cropped image on a display screen; displaying second digital photos with said cropped image, wherein the second digital photos are in a second group and include a same face as the single face for comparing with the cropped image; receiving a user input to choose a specific photo among the second digital photos; and adding the chosen specific photo in said first group on the basis of the single face that is being cropped out from the first digital photo, and removing the chosen digital photo from said second group, wherein a display order of the second digital photos are updated, in accordance with a similarity between the chosen specific photo and a rest of the second digital photos.