An image acquisition unit acquires a plurality of projection images, which are generated by causing an imaging apparatus to perform tomosynthesis imaging for irradiating a subject with radiation under a first imaging condition for tomosynthesis imaging and which respectively correspond to a plurality of radiation source positions at the time of tomosynthesis imaging. A body movement determination unit determines whether or not the body movement of the subject is occurring during tomosynthesis imaging on the basis of the plurality of projection images. A condition setting unit sets a second imaging condition for simple imaging in the imaging apparatus in a case where the body movement is occurring.
