1. A method of acquiring and displaying a face recognition result in real time based on matching face image data extracted from a first digital image that includes a face and stored in a face image library along with an unique identifier and/or biometric data uniquely identifying the face, comprising: acquiring and analyzing a series of preview images and identifying candidate face regions from successive frames within one second prior to capture of a second digital image; based on the analyzing of the series of preview images, acquiring said second digital image and extracting a candidate face region from said second digital image; determining whether that candidate face region extracted from the second digital image includes a face of a same person as the face in the first digital image by applying face recognition to the face region extracted from the second digital image, including analyzing whether the face in the second digital image matches the face in the first digital image; and displaying in real time the second digital image along with the face extracted from the first digital image or with said unique identifier and/or biometric data stored in the face image library along with the first digital image, or combinations thereof.