A psychosomatic diagnosis system in which evaluation of the psychosomatic condition of a person to be diagnosed is performed automatically and objectively, based on the response by voice with respect to a question and the like asked to the person to be diagnosed. The system includes an index database, a speech processing section for obtaining voice as a speech signal, an analog to digital conversion section for converting the speech signal into a digital speech signal, a data processing section for calculating a human strange attractor by using the chaos theory and storing the human strange attractor in the index database, an attractor evaluation section for performing a quantitative evaluation by using the calculated human strange attractor, and a display section for displaying the evaluation result.