After an ink-jet recording head (1) with a plurality of discharging portions (Nos. 1-128) arranged is main-scanned in a direction perpendicular to the direction of the discharging portion arrangement to record a first image area, sub-scanning of the head is performed. Before the head is main-scanned to record a second image area, the sub-scanning is performed so that a few discharging portions (Nos. 1-3) on an upper edge portion of the head (1) in second main-scanning overlap part of the first image area. Ink droplets land on pixels in the overlapping portion twice for each main-scanning, and image density of the pixels in the overlapping portion is controlled by the sum number of the landing ink droplets. This enables image density unevenness of image density, a "black stripe banding" or a "white stripe banding" in a boundary of an image area being recorded in each main-scanning to be markedly reduced.