In order to support cooperative work of human, the research of computer-supported cooperative work has been evolved. And many groupware have been developed in recent years. In the cooperative work of human, the task may involve in the transportation of physical entities that conventional groupware can not handle. We propose an interface architecture for the transportation of physical entities in distributed environments by utilizing mobile robot. In this paper, we propose the multi-agent model that can represent human-robot interaction in distributed environments by extending the multi-agent model of groupware toolkit Michele we have developed. And we have implemented the interface system based on the extended multi-agent model by utilizing autonomous mobile robot Einstein developed in our laboratory. In the paper we describe the multi-agent model, agent description language, implementation issues and application for the office automation.