The research field on intelligent environments that consist of many distributed sensors and robots has been expanding. An intelligent environment is the space where we can easily interact with computers and robots. And we can get useful service from them. In such an environment, location information is very important. In order to achieve that, multiple camera system is promising for seamless object tracking and location system in intelligent environments. In this paper, cooperation method of cameras for seamless object tracking is described. Fuzzy-based handing over of tracking authority for a tracked object is proposed and some simulation results are shown.