A computer determines whether PDL data contained in a print job, which is obtained via a communication interface or an external interface, matches pre-conversion PDL data stored in a conversion rule in a non-volatile memory. When a type of converted PDL data associated with the pre-conversion PDL in the conversion rule matches a type of PDL data determined in a PJL converting process, PJL data that conversion is held is converted to the converted PDL data associated with the pre-conversion PJL data that matches the held PDL data in the conversion rule.