A computer-readable recording medium recorded with a printing program causes a processor of a computer to calculate a rendering area of print data stored in a storing section of the computer as a primary area based on the print data, and to calculate a rendering area of commentary string data to be attached to the print data as a sub-area. The program then judges whether the primary area and the sub-area overlap, and whether the sub-area deviates from an effective printing area. The commentary string data can be changed so that the primary area and the sub-area do not overlap, and so that the entire sub-area is within the effective printing area, if at least one of the judgment results in the judging step is affirmative. The changed commentary string data then is attached to the print data.