There are provided a flour milling pretreatment method for manufacture of rice flour and its apparatus for drastically reducing hardness of rice without having need of water-washing and soaking steps. The method comprises a moisture homogenizing step for supplying low-humidity air to milled rice having a moisture content of 13.0∼16.0% (w. b.%), to adjust the moisture content in the milled rice to 11.0 ∼13.0% (w. b.%), thereby homogenizing the moisture and a moisture conditioning step for adding water to the rice grains had the moisture homogenizing step passed through until the moisture content in each of the rice grains of rice reaches 20. 0∼45.0% (w. b. %), and facilitating water absorption into the core of each of the grains of the milled rice after the water addition.
