1. A digital photographing apparatus comprising: an imaging device that acquires a reference image at a first exposure, and a plurality of additional images at exposures different from the first exposure, the reference image and the plurality of additional images each having a plurality of pixels; a motion data acquiring unit that acquires motion data for each pixel of the plurality of additional images, wherein the motion data for a pixel is a first motion data value if the pixel is in a non-motion area when compared to the reference image and a second motion data value if the pixel is in a motion area when compared to the reference image; a first weight data acquiring unit that acquires first weight data, wherein the first weight data is a first weight for pixels with the first motion data value and a second weight lower than the first weight for pixels with the second motion data value; and a final image data acquiring unit that synthesizes the pixels of the reference image and the plurality of additional images based on first weight data.