A network apparatus controlling method includes: in a device configuration stage, causing the libraries of a plurality of node devices to have the same network key; electrically connecting to the intermediary node device; obtaining the device name of the intermediary node device; according to the device name, identifying the library of the intermediary node device and the content of the library to confirm an accessing encryption process used by the library; and switching to the accessing encryption process to complete the accessing encryption process between the network apparatus controlling device and the intermediary node device such that the network apparatus controlling device can send an order data to the plurality of node devices in the mesh network via the intermediary node device.