PURPOSE:To utilize function of an assumed printing device by setting assumed printing device information that specifies type of a printing device to be used for printing and preparing printing data. CONSTITUTION:Spool description that designates the name of spool file, plural printing devices within optionally designated extent in a group of printing devices 7A-7D, form of printing etc. is described in the spool description section 8 in the disk of a host processor 10. Supposing that assumed printing device information is 'A', and when printing data are inputted after designating spool description from a terminal equipment 9C, a processing program in the terminal equipment 9 prepares printing data of a form that is utilized by the type of device corresponding to the printing device 7A given as assumed printing device information.
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