[Aim] To accurately and efficiently suppress periodic patterns caused by a grid when plural radiographic images are obtained by imaging using the grid.[Solution Means] A first frequency analysis unit (30) performs frequency analysis on a reference radiographic image (B1) of plural radiographic images obtained by tomosynthesis imaging using a grid, and obtains a frequency characteristic of a periodic pattern caused by the grid and a frequency analysis result (R0). A second frequency analysis unit (31) performs, based on the frequency analysis result, limited frequency analysis on a radiographic image or images (Bi (i=2 through n)) other than the reference radiographic image (B1), and obtains a frequency characteristic of the periodic pattern about the radiographic image or images (Bi). A suppression unit (32) performs, based on the frequency characteristic, processing for suppressing the periodic pattern in all of the radiographic images.
