On-the-fly printing allows for effective use of the RIP
waiting time between the completion of RIP
processing for a specific page and the resumption of printing. [Solution] The image forming
system 100 includes a RIP
processing unit 21 that processes print data using the RIP method, a print
instruction unit 23 that instructs the image forming apparatus 1 to print the RIP data, a
delay detection unit 27 that detects pages where the RIP
processing is delayed during on-the-fly printing, which starts printing without waiting for the completion of the RIP processing of the print job, and an alternative
processing instruction unit 28 that instructs the image forming apparatus 1 to interrupt the printing process of the page in question and execute an
alternative process.