Printing apparatus and printing system

A printing system comprising:

• a host apparatus;
• and
• a printing apparatus configured to execute printing based on print data that are received from the host apparatus,
• the host apparatus comprising:
• a transmission unit configured to transmit print data to the printing apparatus;
• a first print completion determination unit configured to determine whether or not printing of the print data has been completed;
• and
• a print job management unit configured to transmit via the transmission unit second print data which are the same print job as first print data that were transmitted to the printing apparatus prior to the second print data, when the first print completion determination unit determines that the printing of the first print data has not been completed in the printing apparatus after the first print data were transmitted from the transmission unit,
• the printing apparatus comprising:
• a printed range store unit configured to store a printed range, which is a part of the first print data that has been printed completely;
• a second print completion determination unit configured to determine whether or not the printing of the first print data has been completed;
• a print job determination unit configured to determine whether or not the second print data corresponds with the first print data;
• an unprinted page determination unit configured to determine unprinted pages of the second print data based on the print range stored by the printed range store unit, when the print job determination unit determines that the second print data corresponds with the first print data;
• and
• a print control unit configured to instruct a print unit to print based on the second print data and the unprinted page determination unit, when the second print completion determination unit determines that the printing of the first print data has not been completed and the print job determination unit determines that the second print data corresponds with the first print data.

A printing apparatus for printing based on print data that are received by the printing apparatus, comprising:

• a print job determination unit configured to determine whether or not print data correspond with previous print data that were received by the printing apparatus prior to the print data;
• a page determination unit configured to determine unprinted pages or printed pages of the previous print data, when the print job determination unit determines that the print data correspond with the previous print data;
• and
• a print control unit configured to instruct a print unit to print the print data based on the determination result of the unprinted page determination unit, when the print job determination unit determines that the print data correspond with the previous print data.