A lot of crimes can be prevented beforehand by this research. It has on the system of crime prevention is sensational because a general person can adequately do this diagnosis in a short time. The mechanism (the check on a potential criminal and following) is necessary and indispensable at the former stage to the crime to decrease the crime. An important judgment of the presence of the mental trouble however is made it reel in the entire specialist's diagnosis, and becomesthe fetter of the necessity of large time, and crime prevention ..drawing a conclusion.,. the wall "Human rights issue". This research is an expression judgment support device that doesn't rely on specialist's experience rule of the possibility that a potential criminal perpetrates a crime by a general person, and can evaluate it from the expression of the face based on psychology, criminology, and psychiatry.