At least one exemplary embodiment is directed to a cradle device which inhibits driving of a pan/tile driving unit in the event of an imaging device being detached from the cradle device, and also receiving a control command of the imaging device from a camera. The cradle device can lock the imaging device in the event that the imaging device is mounted on the cradle device. The cradle device can have a configuration enabling detaching the imaging device, thus facilitating the most appropriate environment for a surveillance system.