It is expected to provide a document image generating apparatus, a document image generating method and a computer program that can keep a layout of original text present in the original text image and then can improve the readability of original text and the readability annotation corresponding to the original text (e.g., translation).A translation 421 of original text 411 is aligned at the interline space between the original text 411 at the first line and the original text 412 at the second line. When the interline space is narrow as shown in FIG. 4B, the original text 411 overlays the translation 421. At that time, the color regarding the original text 411 is changed to be a low visibility color, and the color regarding the translation 421 is changed to be a high visibility color.