To acquire a residual image amount generated in a direct exposure region and perform suitable residual image correction based on the residual image amount.

A dose of radiation which has reached a radiographic image detector without passing through an object is estimated based on the preacquired radiation intensity distribution in the radiographic image detector, the residual image charge amount is acquired based on the estimated dose of the radiation and preset attenuation characteristics of the residual image in the radiographic image detector, and interval of photographing of radiographic images on and after the next photographing so as not to saturate the output of the radiographic image detector, based on the sum of the acquired residual image charge amount and the maximum value of the radiographic image signals detected by the radiographic image detector.