I think shogi FESA and USSF organizations use the rating system which is equivalent to western chess. Please refer to http://www.shogi.net/fesa/rating.intro
A professional players' association exists in Japan. They don't use rating system. They use Dan grading system.
(hide) If you are waiting for your turn, click on "change" next to the "refresh" on the main page, then set refresh the page to 30 seconds to get your turn to move displayed faster. (Servant) (show all tips)