In this paper, component based design and implementation of Intelligent Space (iSpace) are described. iSpace has distributed sensors and actuators that are utilized for providing various services to users based on observation of humans and environments. We present our iSpace system implemented by using RT (Robot Technology) Middleware that is a platform for development support of robot systems. First we discuss the component design of functions of iSpace and present the operation of the developed components. The application of the system to the mobile robot navigation is then presented. The mobile robot navigation functions are also implemented by using RT components. The developed system navigates mobile robots based on information obtained by iSpace and the mobile robots.