A method is provided for performing a camera function including a zoom function by which an image of a subject is photographed in zoom steps so that the image is magnified or reduced. The method comprises the steps of detecting a distance between the subject and a camera, if a shutter key for photographing an image of the subject in a mode for photographing the subject in full size of a screen of a display section is input, regulating the magnification of the zoom in a zoom step stored in advance, corresponding to the detected distance, and photographing the image of the subject in a regulated magnification of the zoom. The optimum zoom step is automatically regulated according to the distance between the subject and the camera, and the image of the subject can be photographed in the full size of the screen of the display section without regulating the zoom directly.