To prevent a nozzle from clogging during the period of long time use.

This method is such that a rotating drum is accommodated in a housing, and ink supplied by a pump, i.e., ink in the rotating drum is continuously spouted filamentously through centrifugal force from a plurality of ink spouting ports formed juxtapositionally on the exterior peripheral surface of the rotating drum, then a part of ink spouted is pressed by a slit mechanism set within the housing for successively producing ink droplets advancing toward recording medium, thereby carrying out recording by controlling flying of ink droplets. On the other hand, the rotating drum is driven (steps S312-314) under a condition of stoppage of the aforesaid pump (step S311), thus preventing ink spouting ports from clogging.