1. A medical apparatus, comprising: an imager that picks up an image of a light from a living tissue; an image processor that generates a first image picked up in a first observation field of view in the imager, and a second image picked up in a second observation field of view in the imager; a discriminator that determines matching of the first observation field of view and the second observation field of view; a processor that performs processing for displaying markers indicating same positions for the first image and the second image when it is determined that the first observation field of view and the second observation field of view match each other in the discriminator; and a display that simultaneously displays the first image and the second image processed in the processor.