ProblemTo make an observation of three dimensional microscope images become easy.SolutionThere is provided an image processor comprising: an accepting unit that accepts designation of at least part of 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 a part of data of the three dimensional magnified image data and a second magnified image based on at least a part of data of the three dimensional magnified image data in which at least a part of data is different from the data of the first magnified image.