1. An apparatus for generating a scaled image, comprising: image dividing means for dividing an image, which consists of a plurality of pixels, into a plurality of blocks by partitioning the image vertically and horizontally; color-space dividing means for dividing color space of the image into a plurality of subspaces; and color decision means for performing a histogram calculation, on a per-subspace basis, with regard to pixels constituting a block of interest among the plurality of blocks, and deciding a representative color of the block of interest in accordance with the average color of pixels belonging to a most frequent subspace among the plurality of subspaces as a result of the histogram calculation.