A radiographing apparatus usable for stitch imaging, includes a radiation sensor configured to acquire a radiographic image signal or radiographic image signals by detecting radiation, a readout circuit configured to read out the radiographic image signal(s), a communication circuit configured to transmit a digital radiographic image based on the radiographic image signal(s) to an external apparatus, a generation unit configured to generate a preview image, based on the radiographic image signal(s), that is smaller in data amount than the digital radiographic image, and a control unit configured to cause the communication circuit to start transmitting the preview image after the readout circuit reads out the radiographic image signal(s), and after completion of the transmission of the preview image, restrict transmission of an image that contains data uncontained in the preview image among data pieces in the digital radiographic image until a specific signal is received from the external apparatus.
