In Japan sea transportation is very important to secure the living of Japanese. An enterprise of a freight service in a port takes this kind of job on itself. The enterprise also has to make a profit to survive. Operating revenue of the enterprise depends on the port characteristics that the business obtains a license to operate. The revenue is decided by the handling volume and the handling items. In this paper we proposed the methods to estimate the handling volume and the revenue in order to consider the port characteristics from the viewpoint of a freight service in a port. And we also classify the ports in Japan into 4 categories by the characteristics.
