1. A photographing apparatus, comprising: a photographing unit to photograph an object and to generate an image from the photographed object; a storage unit to store the generated image generated by the photographing unit as a tag image to associate subsequent photographed images of the object with the tag image; a display unit to display the generated image; and a controlling unit to add the stored tag image as tag information to another generated image that is generated by the photographing unit to create an image file including the tag information of the stored tag image and the another generated image, wherein the storing of the generated image as the tag image comprises: determining whether it is possible to recognize a shape of the photographed object within the generated image to be saved as the tag image, and if the shape of the object within the photographed image is determined to be similar to a shape of the object within a pre-stored image, registering the pre-stored image as the tag image to allow the pre-stored image to be tagged to the subsequent photographed images of the object, and if the shape of the object within the photographed image is determined to not be similar to a shape of an object within the pre-stored image, registering the generated image as a new tag image.