A radiation imaging system includes a radiation imaging apparatus capable of operating as a master unit or a slave unit in wireless communication, and a control apparatus capable of controlling an operation of the radiation imaging apparatus. The control apparatus includes a determination unit configured to determine whether a device operating as the master unit of the wireless communication exists in the radiation imaging system, and a control unit configured to control the operation of the radiation imaging apparatus based on the determination. The control unit controls the operation of the radiation imaging apparatus based on the determination such that one master unit of the wireless communication exists in the radiation imaging system.
