Networking method, device and system

The invention discloses a networking method, device and system. When networking is needed to be carried out on the home terminal node device, instead of networking being carried out on all the node devices and the home terminal node device, the device meeting the networking condition needs to be selected and networking is carried out on the device and the home terminal node device, so that the situation that services among certain node devices are limited through a large number of service strategies is avoided, or mutual access of certain services among devices in different domains is limited; besides, according to the scheme, the node equipment with the same level information as the domain where the home terminal node equipment is located is selected, networking is carried out on the node equipment and the home terminal node equipment, and sharing and management of data between the node equipment in the same domain are achieved; furthermore, the node equipment of which the level information of the domain is