A microscope includes a movable stage supporting wells arranged in an array, a first imaging unit having a low-magnification objective lens, a second imaging unit having a high-magnification objective lens, a computer determining a representative position of a spheroid based on imaging data of the spheroid acquired by the first imaging unit, and a controller causing respective imaging units to sequentially acquire imaging data of the spheroid in each of the wells. The controller causes the first imaging unit to acquire imaging data for the spheroid in one of the wells, and then causes the stage to adjust the representative position to the optical axis of the high-magnification objective lens, and further causes the second imaging unit to acquire imaging data while causing the first imaging unit to acquire imaging data of the spheroid in another of the wells in synchronization with acquisition by the second imaging unit.