In a motion picture capturing system for generating a virtual viewpoint image by a plurality of cameras, if image-capturing is performed with timing being shifted to improve frame rate performance, estimation accuracy is deteriorated due to an error in corresponding point detection between images or the presence of a moving subject. The image-capturing timing is controlled such that two or more of a plurality of image-capturing units perform simultaneous image-capturing, and motion of the whole of an image-capturing apparatus is estimated from a plurality of images captured by the simultaneous image-capturing. The virtual viewpoint image is synthesized from the images captured by the simultaneous image-capturing by the plurality of image-capturing units and the estimated motion.