WAN connection query method, gateway and terminal management device and system

The invention discloses a WAN connection query method, a gateway and a terminal management device and system and relates to the technical field of terminal remote management. Each disclosed embodiment provides a mechanism which realizes rapid search of a WAN connection through expansion of WAN connection key parameter fields of a TR-069 node so that a WAN connection index is obtained through the obtained WAN connection parameter fields and thus a WAN connection which is inquired is determined. Based on a prior gateway parameter model, under a condition that an overall framework of a TR-069 parameter model is not changed, through expansion of the TR-069 node, attribute information of the WAN connection is included and the key parameters in the WAN connection are used as query content of the WAN connection to realize determination of the WAN connection index through one query and thus the WAN connection is found rapidly.