The PhD is a doctoral degree, specifically called a "doctor of philosophy" degree. This is misleading because PhD holders are not necessarily philosophers (unless they earned their degree in philosophy!). That said, PhD recipients are able to engage in thought experiments, reason about problems, and solve problems in sophisticated ways.
People who earn a PhD in business, economics and administration typically go on to teach in universities or perform statistical research for large organizations. Moreover, anyone with a PhD degree has the right to be addressed as "Dr."
Japan has one of the highly integrated higher education systems in Asia. Japans approach to science and technology is highly rated thus their education levels very structured from childhood to primary through secondary to tertiary levels. With 126 million people living in Japan it has a cultural rich environment. Greater Tokyo area is the largest metropolitan area in the world, with over 30 million residents.
Top Doctoral Programs in Business in Japan 2017
PhD - Doctor of Philosophy in Global Studies (60 credits) [+]