3. A structural formula display method performed by a hardware system for displaying a structural formula of a compound, said structural formula display method comprising: accepting the structural formula; dividing, by a character string divider included in the hardware system, a character string corresponding to a part of the structural formula into a plurality of substrings, each of said substrings corresponding to a group derived by dividing the part of the structural formula at each bonding site on a main chain, the character string divider executing a character string dividing process; reversing an order of alignment of the plurality of substrings in the character string, the hardware system reversing only the plurality of substrings derived through the dividing executed by the character string divider; and displaying the structural formula after the reversal.
4. The structural formula display method of claim 3 , wherein a substring out of the plurality of substrings is modified in the operation of dividing a character string.