Patent ID: 7639378

Claim:
A printing system comprising: a conversion unit which performs conversion processing for print data by using a filter module specified by filter information attached to the print data; a history storage unit which stores filter information for specifying the filter module used by said conversion unit; a filter re-designation unit which reads out the filter information stored by said history storage unit and attaches the filter information to the print data; and a filter designation unit which determines a filter module for use in accordance with a print setting and attaches, to print data, filter information for specifying the filter module, wherein the filter information attached by said filter designation unit does not contain version information, and the filter information attached by said filter re-designation unit contains version information, and when the filter information contains version information, said conversion unit performs print data conversion processing using a corresponding filter module of a corresponding version, and when the filter information does not contain version information, performs print data conversion processing using a filter module of a latest version.