The Monbukagakusho Scholarship Programme
This site is by no means an authority on the subject. But, we do have some information that may be helpful to you.
If you would like to receive the Monbukagakusho Scholarship of the Japanese Government, you should visit the Japanese Embassy/Consulate in your home country and ask for further information there. They are in charge of accepting applications, organizing exams and forwarding your application to Japan for evaluation.
Knowing Japanese language may or may not be an advantage during the application process. It is up to embassy or consulate and the Japanese government, and the guidelines may be different from country to country, year to year. Go to the Japanese Embassy/Consulate in your home country, they have the authoritative information on the subject.