1. An image processing apparatus comprising: a image processor processing a viewing images and still images an image generated by a camera at every frame period; a timing manager storing the viewing image processed by the image processor temporarily and outputting the viewing image at a preset time of a frame period; and a controller controlling, in response to a capture request, the image processor to process the still image at a residual part of a current frame to be at a beginning part of a next frame and to process the buffered viewing image to be at the residual part of the next frame,