Patent ID: 7973956

Claim:
A high speed printing method comprising: opening a document to be printed; generating rendered data by rendering print data of the document to be printed and storing the generated rendered data; receiving a print request corresponding to the document to be printed; determining whether any of the print data has been modified since the rendered data was generated, and if it is determined that some of the print data has been modified, then determining whether a start page exists among the modified print data, wherein if a start page does not exist among the modified print data, then transmitting rendered data of the start page to be printed while generating another rendered data of the modified print data, and then transmitting said another rendered data; and printing the rendered data and said another rendered data as they are received, wherein the opening of the document, the generating of the rendered data and said another rendered data, and the receiving of the print request are performed by a host, and the printing of the stored rendered data and said another rendered data is performed by an image forming device connected to the host.