A common region derivation unit derives a common region common to at least some of a plurality of projection images which correspond to a plurality of radiation source positions, respectively, and are acquired by directing an imaging apparatus to perform tomosynthesis imaging. In a case in which a width of the common region in a movement direction of a radiation source is equal to or greater than a predetermined threshold value, an image acquisition unit directs the imaging apparatus to perform the tomosynthesis imaging to acquire the plurality of projection images.