Apparatus and method of blurring background of image in digital image processing device

A digital image processor and a method, specifically, an apparatus for blurring a background of an image in a digital image processor is provided wherein an image is photographed with a flash being on and off when a shutter input signal is received once, the background of the image is blurred through comparison between an image prior to the shutter input signal being received and an image during which a flash is activated, and then a subject of the image with a flash being off is combined with the blurred background. A processor blurs an image generated by a brightness difference between a first image generated before a shutter input signal is received and a second image generated with the flash being on after the shutter input signal is received and combining a third image generated by turning off the flash after the shutter input signal, to the blurred image.