1. A radiographic image capturing system comprising: a plurality of radiation converters and one processor, one radiation converter and a plurality of processors, or a plurality of radiation converters and a plurality of processors, wherein each radiation converter converts radiation that has passed through a subject into a radiographic image, and each processor processes the radiographic image; and a selector for selecting one radiation converter and one processor based on a communication state between each radiation converter and each processor, and associating the selected one radiation converter with the selected one processor.