The present application provides a method for interconnection between a terminal device and a gateway device. When the terminal device detects that the terminal device and the gateway device meet a first connection condition and that it is the first time the terminal device is to be connected to the gateway device, acquiring, from the gateway device, a first common SSID preset in the gateway device; and when authentication performed by the terminal device on the acquired first common SSID succeeds, sending a second common SSID preset in the terminal device to the gateway device, so that when authentication performed by the gateway device on the second common SSID succeeds, a common SSID-based connection is established between the terminal device and the gateway device. So using the method, processing of interconnection between a terminal device and a gateway device takes a short time and a process is relatively simple.