An information processing device including at least one processor, wherein the processor is configured to: acquire positional information indicating a position of a compression member, which is configured to be movable in a plane direction of a contact surface with a breast, in the plane direction in a mammography apparatus that irradiates the breast compressed by the compression member with radiation to capture a radiographic image; and perform control to direct an image projection unit, which projects a projection image onto a projection surface of the compression member, to project the projection image onto the projection surface of the compression member whose position has been specified on the basis of the positional information.