Several machine tool vendors have developed maintenance support systems using the internet, but the systems are dependent upon each particular machine tool vendor. Moreover, most systems merely monitor Open NC's console. Consequently, these maintenance systems cannot accommodate other resources such as materials and documents. For that reason, this study examines a portal collaboration type operation and maintenance support system. The system accommodates a controller's information along with other resources. This paper describes the system concept and a document management system that collaborates with the 3-D Remote monitoring system as one system component.