A body thickness estimation unit estimates a body thickness of a subject for each pixel of a radiographic image including a primary ray component and a scattered ray component, on the basis of the radiographic image. A bone part pixel value acquisition unit acquires a bone part pixel value which is a pixel value of a bone region of the subject, on the basis of the radiographic image. An information acquisition unit acquires bone mineral information indicating a bone mineral content of the bone region for each pixel of the bone region on the basis of imaging conditions in a case in which the radiographic image has been acquired, the body thickness for each pixel, and the bone part pixel value.
