Terminal management method, device and system

The invention provides a terminal management method, a device and a system thereof, belonging to the field of mobile communication. The terminal management method comprises the following steps: a terminal receives a second session command which is transmitted by a second server and carries equipment capacity identification, and the terminal requests to modify the equipment capacity; the terminal judges whether the equipment capacity is allowed to be modified; when the equipment capacity is allowed to be modified, the terminal allows the second server to modify the equipment capacity; and when the equipment capacity is not allowed to be modified, the terminal judges whether the second server has the authority of modifying the equipment capacity, and allows or prohibits the second server from modifying the equipment capacity according to the judgment result. The embodiment of the invention can manage and coordinate among multiple servers when the multiple servers all manage the terminal equipment capacity. The technical scheme of the invention can be widely applied to the terminal technology in the field of communication.