A radiation image capturing system comprising: a mammography apparatus, the mammography apparatus comprising: a radiation source driver configured to move a radiation source to a plurality of first imaging positions where first imaging of emitting radiation with first energy from the radiation source to capture a radiation image by a radiation detector is performed, and to a second imaging position where the first imaging and a second imaging of emitting radiation with second energy different from the first energy from the radiation source to capture a radiation image by the radiation detector are performed; and a controller (60,70) configured to cause the radiation detector to perform the first imaging at the first imaging positions in a state where the radiation source is moved by the radiation source driver, and to cause the radiation detector to perform the first imaging and the second imaging at the second imaging position in a state where the movement of the radiation source is stopped or the radiation source is moved at a moving speed slower than a moving speed at the first imaging position by the radiation source driver; characterised in that the radiation image capturing system further comprises an image generation unit configured to acquire a plurality of first radiation images captured in the first imaging and a plurality of second radiation images captured in the second imaging from the mammography apparatus, to generate a tomographic image reconstructed using the plurality of first radiation images, to generate a differential image between the plurality of first radiation images captured at the second imaging positions and the plurality of second radiation images captured at the second imaging positions for each second imaging position, and to generate a differential tomographic image reconstructed using each generated differential image. a mammography apparatus, the mammography apparatus comprising: a radiation source driver configured to move a radiation source to a plurality of first imaging positions where first imaging of emitting radiation with first energy from the radiation source to capture a radiation image by a radiation detector is performed, and to a second imaging position where the first imaging and a second imaging of emitting radiation with second energy different from the first energy from the radiation source to capture a radiation image by the radiation detector are performed; and a controller (60,70) configured to cause the radiation detector to perform the first imaging at the first imaging positions in a state where the radiation source is moved by the radiation source driver, and to cause the radiation detector to perform the first imaging and the second imaging at the second imaging position in a state where the movement of the radiation source is stopped or the radiation source is moved at a moving speed slower than a moving speed at the first imaging position by the radiation source driver; a radiation source driver configured to move a radiation source to a plurality of first imaging positions where first imaging of emitting radiation with first energy from the radiation source to capture a radiation image by a radiation detector is performed, and to a second imaging position where the first imaging and a second imaging of emitting radiation with second energy different from the first energy from the radiation source to capture a radiation image by the radiation detector are performed; and a controller (60,70) configured to cause the radiation detector to perform the first imaging at the first imaging positions in a state where the radiation source is moved by the radiation source driver, and to cause the radiation detector to perform the first imaging and the second imaging at the second imaging position in a state where the movement of the radiation source is stopped or the radiation source is moved at a moving speed slower than a moving speed at the first imaging position by the radiation source driver; characterised in that the radiation image capturing system further comprises an image generation unit configured to acquire a plurality of first radiation images captured in the first imaging and a plurality of second radiation images captured in the second imaging from the mammography apparatus, to generate a tomographic image reconstructed using the plurality of first radiation images, to generate a differential image between the plurality of first radiation images captured at the second imaging positions and the plurality of second radiation images captured at the second imaging positions for each second imaging position, and to generate a differential tomographic image reconstructed using each generated differential image.