1. A microscope device comprising: a plurality of observation optical systems that are capable of acquiring images of the same sample; a region specifying unit that specifies, on a reference image acquired by one of the observation optical systems, an acquisition region for acquiring an observation image with another one of the observation optical systems; and a field-of-view displaying unit that displays, superimposed on the reference image, an indication indicating a maximum field of view of the other observation optical system.