1. A structural formula display system for displaying a structural formula of a compound, comprising: an input unit for accepting the structural formula; a character string divider for dividing 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; an alignment reverser for reversing an order of alignment of the plurality of substrings in the character string; and an output unit for displaying the structural formula after the reversal.