Abstract
We perform a study about the necessary information communication technologies and these applied methods to realize ubiquitous informational society. In the technology that is important to realize ubiquitous informational society, there is wireless LAN. As a part of this study, we are doing research in order to realize the ubiquitous health care information system using wireless LAN which can grasp one s health condition in real-time (anytime, anywhere). In order to realize this system, a most fundamental and important problem is the influence of the object given to wireless LAN communication. Therefore, in this paper, the influence of the plants (unmoved object) which exists in wireless LAN communication environment was investigated by experiment. And the result is shown.