Abstract: An uninterruptible power supply (UPS) apparatus is controllable by a monitoring apparatus via a network system. The UPS apparatus includes a backup power supply module and a network adapting module. The backup power supply module is used for providing stable and continued power supply to a load, and includes a controller. The network adapting module includes a network controller and a network physical transmission device. The network controller is electrically connected to the controller of the backup power supply module for controlling data transmission between the network adapting module and the backup power supply module. The network physical transmission device is electrically connected to the network controller for controlling data transmission between the network adapting module and the monitoring apparatus.