Medical apparatus consisting of a first imaging device including a first image sensor having a first field of view, and a second imaging device including a second image sensor having a second field of view smaller than the first field of view. The apparatus also includes a processor configured to process a first image acquired by the first image sensor so as to generate a first processed image having a first image magnification, and to process a second image acquired by the second image sensor so as to generate a second processed image having a second image magnification. The processor is also configured to adjust the first image magnification to be equal to the second image magnification so as to form an adjusted first image, and to generate a stereoscopic image based on the adjusted first image and the processed second image.