Reliability of total ship handling system including human must be improved as by compensating the part where human make mistakes. Although compensation for hardware such as double hull can be effective for accidents, more reasonable and effective compensational way is to develop ship handling system that prevents accident. In other word, it would be reasonable to develop software concerning handling. In this paper, the support system is developed for berthing maneuver which is one of the most difficult maneuver. The present berthing support system can only display the items of current condition and forecast to the very limited extent of future. A rule based support in the information processing has not been realized, let alone a knowledge based support. The proposed berthing support system has realized leading support function and evaluation function in order to satisfy knowledge based support. The effectiveness of the proposed support system was confirmed through the experimental berthing maneuver utilizing ship handling simulator.