Warm and wet air are applied to brown rice with germinated germs, produced by adding water to the brown rice, for removing water attached to a surface of the rice. A surface of the germinated brown rice is polished by a rice-polishing machine while remaining the germinated germs to obtain rice with germinated germs. Water of about 1 to 10% of rice weight is added to soften the rice surface. The rice and granules whose granule size is set to a constant granule size smaller than that of the rice and which is heated to 60 C. or higher are mixed with the rice and stirred. Rice bran remaining on a rice surface after polishing is absorbed by the granules and is removed. And, the rice and granules are separated from each other.