1. A method of outputting through a photo printer an image stored in an image storage device, the method comprising: setting a temporary printing area on an image to be printed; determining whether or not an option for Paper-full printing is selected; if the Paper-full print option is selected, detecting a face area on the image; determining whether or not the detected face area is included in a printing area; and according to the determination result, adjusting a printing area so that the face area can be included in the printing area, wherein the adjusting of the printing area comprises: determining whether or not the aspect ratio of the image and the aspect ratio of the printing material are substantially different from each other; and moving the printing area according to the determination result, wherein the moving of the printing area comprises: if the aspect ratio of the image is less than the aspect ratio of the printing material, the printing area is moved upwards or downwards; if the aspect ratio of the image is greater than the aspect ratio of the printing material, and if a face area in only one of the left and right sides on the image exists outside the printing area, the printing area is moved in a left or right side direction such that the face area is included in the printing area; and if the aspect ratio of the image is greater than the aspect ratio of the printing material, and if a first face area and a second face area on the left and right sides of the image exist outside the printing area, an area which is excluded from printing is displayed for a user with a warning message.