In this study, an Internet Protocol(IP)-based integrated network management system(INMS) that canbe managed on site and remotely was designed. To derive the requirements for an offshore plant INMS, the status of the offshore plant-related industries was analyzed, and the structure and functions of the system were designed by referring to the actual ship-owner specifications and shipbuilding yard POS. In particular, the communication environment and protocol, as well as the data structure, were designed for the telecommunication and networkbased remote management of various system and devices in the offshore plant.