12. A tape printing apparatus, comprising: selection means for selecting a print format from a plurality of print formats, each print format corresponding to instructions stored in a memory; character input means for inputting at least one character string containing a plurality of characters; storage means for storing the character string; printing means for printing the stored character string on a tape defining a longitudinal direction according to the instructions for the print format; and control means for equally spacing the characters of the character string along a predetermined print length and printing the characters, the control means comprising arranging means for, when the print format defines a horizontal writing index tab print format, arranging a vertical direction of each character of the stored character string in agreement with a transverse direction transverse to a longitudinal direction of the tape and arranging said each of the characters in the longitudinal direction of the tape, the character string is printed from a head thereof in a line and from a rear thereof in another line.
12. A tape printing apparatus, comprising: selection means for selecting a print format from a plurality of print formats, each print format corresponding to instructions stored in a memory; character input means for inputting at least one character string containing a plurality of characters; storage means for storing the character string; printing means for printing the stored character string on a tape defining a longitudinal direction according to the instructions for the print format; and control means for equally spacing the characters of the character string along a predetermined print length and printing the characters, the control means comprising arranging means for, when the print format defines a horizontal writing index tab print format, arranging a vertical direction of each character of the stored character string in agreement with a transverse direction transverse to a longitudinal direction of the tape and arranging said each of the characters in the longitudinal direction of the tape, the character string is printed from a head thereof in a line and from a rear thereof in another line. 17. A tape printing apparatus according to claim 12, wherein said arranging means arranges said character string in agreement with the transverse direction of said recording medium.