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This paper proposes a home automation system using a PDA(Personal Digital Assistants)-based intelligent robot system architecture which consists of three layers; a user layer, a manager layer, and an action layer. In the user layer, users manage and control the robot, and get visual information via the remote monitoring system. In the case of showing maps with the status of the robot, synchronization is very important. In the manager layer, there are three parts; a server part, a home appliances part, and a storage part. The server part manages all the status information of the house, the home appliances part controls all appliances, and the storage system stores all the status information of the house. In the action layer, the main robot system uses a PDA instead of a computer. As a PDA has limited performance, simple algorithms are required. It has an intelligent functional engine for SLAM(Simultaneous Localization And Mapping) and vision processing. We have developed the PDA-based mobile robot system for home automation based on this architecture in order to verify its efficiency.