A system connection setting device, for setting a connection between a household appliance and a mobile device connected to an Internet, comprises a wireless communication unit mounted and electrically connected to the household appliance and having a unique identity data, a communication unit connected to a server via the Internet and a remote controller for sending a wireless input signal. The wireless communication unit responds to the wireless input signal, establishes a connection with the communication unit and transmits the unique identity data to the communication unit, so that the communication unit transmits the unique identity data to the server, and the server stores the unique identity data and an identity code corresponded to the mobile device uniquely as a pairing information related to the wireless communication unit and the mobile device. The present invention further provides a connection setting method implemented via the connection setting device.