In recent years, various systems based on electron-ics, such as cars, computers and robots have been get-ting into our daily lives. Unfortunately, asymmetrical relationship exists between human and such systems, imposing burdens especially on elderly or handi-capped persons. In order to solve various problems for balancing such asymmetrical relationship, humatron-ics is proposed. Main purpose of humatronics is to establish the symmetric interaction between human and electronic systems by giving the systems the capa-bility of understanding humans. Another important factor for humatronics is computer networks, over which the systems can share knowledge, information, and experiences. This paper introduces the concept of humatronics and key technologies for realizing it. A prototype system that is currently developed based on the concept of humatronics is also introduced.