The present invention is a zero-configuration system including a registration server connecting (via the Internet) to a network terminal device through a network connection device, and a first network device located in a local area network same as the two devices and having a first identification name and a set of configuration values, wherein the registration server stores the first identification name corresponding to a user information. The network terminal device can login to the registration server by using the user information, and then scan the local area network and, when detecting a second network device having a second identification name not yet stored in the registration server, automatically receive the first identification name from the registration server, obtain the configuration values from the first network device, and configure the second network device according to the configuration values, so as to automatically connect to and access the second network device.