An apparatus and method to tag ID in photos by utilizing geographical positions is provided. The apparatus to tag a photo with an ID based on a relative physical position includes a pose calculation module to calculate the pose of a camera in space photographing subjects, a photographing angle calculation module to calculate an angle at which each of the subjects is photographed, by using the calculated pose information and camera information, a coordinates calculation module to obtain the calculated photographing angle and the predetermined ID information of the subjects and to calculate the relative distance and coordinates between the subjects, a valid subject selection module to identify the subjects located within the photographing angle by using the calculated relative distance and coordinates, and an image tagging module to tag the photographed image ID information of the identified subjects.