In controller 3 which controls a reader reading radiographic image recorded in a cassette, display controlling means 13 is provided, wherein pre-registration mode in which radiographing is conducted to acquire an image after correlation between body part information and a cassette is registered as radiographing reservation information, a post-registration mode in which correlation between body part information and a cassette insertion order is registered as radiographing reservation information and a image is acquired, as well as a mode in which image is acquired without registration of correlation as radiographing reservation information are displayed to be selected and the process is continued hereafter according to the user's selected mode.