1. An ophthalmologic apparatus, comprising: A fundus image acquisition unit arranged to acquire a first fundus image of an eye to be inspected and a second fundus image of the eye during a period different from a period during which the first fundus image is acquired; an extraction unit arranged to extract a plurality of characteristic images from said first fundus image of an eye to be inspected; a calculation unit arranged to calculate at least an amount and a direction of a rotation of movements of the eye to be inspected based on the plurality of characteristic images and the second fundus image.