Abstract: There is provided a method for transforming numeric information into a character string which is generated by a combination of characters and symbols, whereby a character string can be generated which does not make up a combination of character strings which violates the public order and morals, including a storage unit for storing inhibited terms, a table creating unit for creating an inhibited term exclusion table based on the inhibited terms stored in the storage unit and a character string generating unit for generating a character string which excludes the inhibited terms based on the table created by the table creating unit, wherein a character string is generated which contains no such inhibited terms when transforming numeric information into a character string.