A microscope includes a zoom optical system zooming over a sample, a zoom driving unit moving the optical system along an optical axis, an imaging unit imaging an observation image of the sample through the optical system, thereby generating image data on the sample, and a display unit displaying an image corresponding to the generated image data. A touch panel on a display screen of the display unit accepts an input corresponding to a contact position of an object. A driving control unit outputs a driving signal for changing a zoom magnification of the optical system by setting a middle point between contact positions on the touch panel corresponding to two position signals responsive to an input of the different contact positions as a zoom center position fixed without depending on the zoom magnification of the optical system when the two position signals are output from the touch panel.