[Sangetsu]

Public or private, as long as your school or university is nationally accredited it will be okay.

Some online colleges are not recognized as accredited by Japan, even if they are accredited in other countries. At the moment, University of Phoenix is the most well known school which is not acceptable to Japan. It's kind of a shame, because I was considering a masters degree program with them, I'm glad I didn't waste my money (even online universities are not cheap).