An image processor includes an accepting unit that accepts designation of at least part of a three dimensional microscope image data, and an image generator that generates three dimensional magnified image data based on the designation. In the image processor, the image generator may sequentially output a first magnified image based on at least part of data of the three dimensional magnified image data, and a second magnified image based on the at least part of data of the three dimensional magnified image data which has at least part of data different from the first magnified image.
