The study is made with the prime object of determining the project management systems appropriate to Japanese companies when carrying out internationl projects. In order to decide upon effective management methods and for the purpose of clarifying the essential diffrence in basic concepts, as between own country's ways and those of others, it is necessary, first cultural anthropology and sotiology in respective countries. With such due considerations, this study analyses how Japanesse management characteristic, which are firmlyrooted in processes and sociohuman characteristic of Japanese people, affect execution of internationl projects.