An image processing apparatus and method for regulating viewing image output of the image processor which processes motion and still images in a time divisional manner are provided. The image processing apparatus includes an image processor processing the viewing and still images in a time divisional manner, 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, wherein the residual part of the next frame is a part which remains after processing the still image completely.