A radiographic apparatus includes a radiation source for emitting radiation, a radiation source control unit for instructing the radiation source to emit the radiation, and a radiation detector for detecting the radiation. The radiation detector outputs real-time detection data when the radiation source emits the radiation intermittently or continuously, and outputs quiescence detection data when the radiation source emits still radiation. The quiescence detection data is acquired by the radiation source control unit controlling the radiation source to start emitting the radiation at a time earlier than a predicted point of time by a predetermined time calculated based on an estimated irradiation time.