4. A tape printing apparatus according to claim 2, wherein said plurality of kinds of print format include a landscape vertical writing print format, and wherein when said landscape vertical writing print format is selected as said designated print format, said print image-forming means forms said print image data by making a vertical direction of character image data corresponding to said each character of said character string in agreement with a direction corresponding to said transverse direction of said recording medium in the form of a tape, and arranging said character image data in said transverse direction of said recording medium in the form of a tape.
2. A tape printing apparatus according to claim 1, wherein said plurality of print formats are grouped into a first print format group including a vertical writing print format for printing by making a lateral direction of said each character in agreement with a transverse direction of said recording medium in the form of a tape and arranging said each character in said longitudinal direction of said recording medium in the form of a tape, and a horizontal writing print format for printing by making a vertical direction of said each character of said character string in agreement with said transverse direction of said recording medium in the form of a tape and arranging said each character in said longitudinal direction of said recording medium in the form of a tape, and a second print format group including other print formats than said vertical writing print format and said horizontal writing print format.