A printing apparatus includes a print drawing data storage storing first print drawing data from a print data generation apparatus, an administration information unit storing administration information of the first print drawing data, and an image processing unit. The print data generation apparatus includes a pattern data register registering pattern data corresponding to first image information, a pattern data converter, a first image converter converting the pattern data into the first print drawing data, a second image converter converting second image information into second print drawing data, and an image composition unit combining the first and second print drawing data. The image processing unit determines whether administration information of first print drawing data newly received and already stored in the administration information unit are the same. If so, the image processing unit combines the first print drawing data already stored and the second print drawing data.