1. A digital photographing apparatus comprising: an image generator unit configured to generate an image comprising a subject, which is a face, based on image light received from the subject by an imaging device; a subject recognizer unit implemented in a computer-based processing unit that is programmed to automatically recognize the subject from the generated image of the subject using a face recognition algorithm; a cue selector unit in the computer-based processing unit that is: programmed to search a database containing a plurality of pre-stored cues that are associated with a corresponding plurality of pre-stored subjects to automatically select a cue according to the recognized subject; and an output unit configured to output the selected cue, wherein the output unit comprises a first display which is disposed in a side of the digital photographing apparatus facing the subject and is configured to display an image corresponding to the selected cue.