The studies on the origin of life have provided insight into the knowledge about life. Besides, if one can successively develop a unified theory for the description of the variety of life-like systems, the chemical processes towards the origin of life from molecules could be understood on the basis of the unified theory. Thus, I have attempted to develop such a unified theory, which cover the different types of biosystems involving chemical evolution, the evolution of organisms, and the civilizations of humans. According to my previous studies, the principle and the framework of the theory are discussed.