1. A digital photographing apparatus that applies a high-speed multi-autofocusing (AF) method, the digital photographing apparatus comprising: a photographing lens; an image pickup unit that converts image light obtained from a subject through the photographing lens into an electrical signal to generate an image signal; a driving unit for driving a focus lens of the photographing lens; a calculation unit for calculating an AF evaluation value by performing AF on the image signal; a multi-AF detection unit that detects a peak of an AF evaluation value of each multi-point into which a captured image formed by the image signal is divided; a scanning unit for scanning respective peaks of the multi-points of the captured image; and a region detection unit for determining a range of potential peak (RPP) and for inverting a driving direction of the focus lens when the location of the focus lens is outside the RPP, wherein the scanning unit scans around a final end in the near direction or a final end in the ∞ direction.