Version upgrading method, cloud server and system

The invention relates to the technical field of communication, and discloses a version upgrading method which comprises the following steps: acquiring standing time of terminal equipment based on an upgrading request of the terminal equipment; according to a comparison result of the standing time and a preset time threshold value, whether the latest version firmware is sent to the terminal equipment or not is selected; and in the process of sending the latest version firmware to the terminal equipment, if the state of the terminal equipment is in use by the user, stopping sending the latest version firmware. According to the method, the terminal equipment is judged not to be used by the user by acquiring the standing time of the terminal equipment, firmware upgrading can be carried out under the condition that the user does not use the terminal equipment, and the use state of the equipment is acquired in real time in the upgrading process to terminate firmware upgrading, so that the user is prevented from bei