1. An image processing apparatus comprising: a movement amount deciding unit configured to decide a movement amount for moving a target object that is a movement target among objects included in a plurality of captured images imaged by an imaging device including optical units that have imaging ranges overlapping with each other in part on the basis of a distance from the imaging device to the target object and an angle from a reference line at a reference position of the imaging device to the target object in a manner that the plurality of captured images look like images imaged from the reference position, the imaging device using all directions as an imaging range, the plurality of captured images corresponding to the respective optical units.