It is intended to provide a label data creating apparatus, a label data creating method, and a computer program product which can make the production of label tapes faster, and increase efficiency of the production thereof. A CPU of computer equipment performs a template data create process by an editor with a display, a keyboard and the like, and selects a model name of a tape printer displayed in a transfer destination selection field as a transfer destination, when a transfer command is issued. After the selection, the CPU creates print data composed of block information included in the template data and text data, and then shows error message in the display if at least one value of block height data is smaller than that of the height of the minimum font size stored in the tape printer as the transfer destination, based on the block information of the print data.