PURPOSE: To obtain cooked rice suited to Japanese fanciness by efficiently modifying Indica-type oblong-grained seed rice through thawing under humldification of the rice obtained by freezing such polished seed rice to sufficiently absorb water to the deep inside of the rice grains and shorten the time of thawing the rice.

CONSTITUTION: For example, Indica-type oblong-grained polished seed rice of Thailand growth is gradually frozen at -25°C into frozen rice, which is then charged into a rice mixer where the rice is fed with steam under gradual agitation and thawed while warming and humidifying it to modify the oblong- grained seed rice.