When compared with Japan, the Secretariat corresponds to the Nakatsukasasho, the Chancellery corresponds to the Giseikan, and the Department of State Affairs corresponds to the Left and Right Benkan's Offices and the eight ministries under them; therefore, it is clear that the Daijokan had considerable influence in that it served concurrently as both the Chancellery and the Department of State Affairs and also controlled the Nakatsukasasho, which corresponds to the Secretariat, and above all, the Giseikan, i.e. the nobility, corresponding to the Chancellery, played a very important role in Japan.
日本と比較してみると、中書省が中務省、門下省が議政官、尚書省が左右弁官およびその下の八省に当たる、日本では太政官が門下・尚書の両省を兼ねて更に中書省である中務省を指揮するなど強力な権限を有し、とりわけ門下省に当たる議政官、即ち貴族層の役割が非常に大きかったことが判る。