A digital image processing apparatus and method for supporting a RAW format (a sensor data format before image processing is performed) selectively supports a user-desired region of a captured image in a RAW format. A method of supporting a RAW format in a digital image processing apparatus includes setting at least one portion of an image displayed in a live-view mode as a region of interest (ROI), storing the ROI in a RAW format, storing a non-ROI of the displayed image, which is a portion of the image other than the ROI, in a compression format, and compositing the stored ROI with the stored non-ROI.