In a tape printing device, pressing the print execution key when print data and size data are stored on the memory causes the tape printing device to perform a calculation to obtain the total character height based on the number of print lines L and the vertical size of the print image. The tape printing device further performs a calculation to obtain the total blank space width based on the total height and the print allowance area and distributes the total width into the upper blank space width, the lower blank space width and the blank space width between the print lines based on the result of the calculation. The blank spaces are positioned according to the blank widths. The dot pattern data is spread along the base lines and positioned in the process.