An image processing apparatus comprising: acquisition means for acquiring each frame image as an input image; generation means for generating images of a plurality of sub-frames with respect to the input image; and output means for outputting the sub-frame images, wherein said generation means comprises: first composition means (106, 302) for generating a first composite image by compositing the input image and a previous input image at a first composite ratio and for generating a second composite image by compositing the input image and the previous input image at a second composite ratio, wherein the previous input image is an image acquired before the input image; first generation means for generating an image obtained by emphasizing high frequency components in the first composite image as a high frequency component emphasized image; second generation means for generating an image including low frequency components in the second composite image as a low frequency component image; second composition means (303, 304) for generating a first output frame by compositing the high frequency component emphasized image and the low frequency component image at a third composite ratio and for generating a second output frame image by compositing the high frequency component emphasized image and the low frequency component image at a fourth composite ratio; and adjustment means for adjusting the first composite ratio, the second composite ratio, the third composite ratio and the fourth composite ratio for respective frames, wherein the output means is configured to alternately output the first output frame and the second output frame as sub-frame images of the input image. acquisition means for acquiring each frame image as an input image; generation means for generating images of a plurality of sub-frames with respect to the input image; and output means for outputting the sub-frame images, wherein said generation means comprises: first composition means (106, 302) for generating a first composite image by compositing the input image and a previous input image at a first composite ratio and for generating a second composite image by compositing the input image and the previous input image at a second composite ratio, wherein the previous input image is an image acquired before the input image; first generation means for generating an image obtained by emphasizing high frequency components in the first composite image as a high frequency component emphasized image; second generation means for generating an image including low frequency components in the second composite image as a low frequency component image; second composition means (303, 304) for generating a first output frame by compositing the high frequency component emphasized image and the low frequency component image at a third composite ratio and for generating a second output frame image by compositing the high frequency component emphasized image and the low frequency component image at a fourth composite ratio; and adjustment means for adjusting the first composite ratio, the second composite ratio, the third composite ratio and the fourth composite ratio for respective frames, first composition means (106, 302) for generating a first composite image by compositing the input image and a previous input image at a first composite ratio and for generating a second composite image by compositing the input image and the previous input image at a second composite ratio, wherein the previous input image is an image acquired before the input image; first generation means for generating an image obtained by emphasizing high frequency components in the first composite image as a high frequency component emphasized image; second generation means for generating an image including low frequency components in the second composite image as a low frequency component image; second composition means (303, 304) for generating a first output frame by compositing the high frequency component emphasized image and the low frequency component image at a third composite ratio and for generating a second output frame image by compositing the high frequency component emphasized image and the low frequency component image at a fourth composite ratio; and adjustment means for adjusting the first composite ratio, the second composite ratio, the third composite ratio and the fourth composite ratio for respective frames, wherein the output means is configured to alternately output the first output frame and the second output frame as sub-frame images of the input image.