1. An image capturing apparatus comprising: an image capturing unit adapted to capture an image of an object and sequentially acquire image data associated with the image capturing; a storage unit adapted to store model data associated with a first feature quantity calculated from a feature point of the object in a model image; a calculation unit adapted to calculate a second feature quantity from a feature point of the object in the acquired image data; a first estimation unit adapted to estimate, on the basis of the second feature quantity and the model data, a timing when the object satisfies a predetermined condition; and a control unit adapted to store the image data corresponding to the estimated timing in an image data storage unit.