US Patent 7675637 Printing system, printing method, printing apparatus and output apparatus

A CPU of a printing apparatus stores print data that is output from an output apparatus in a storage portion, and waits for the print switch on an operation panel to be operated before printing. If the print data pertaining to printing is administrative-use print data for which the output result is to be provided to a store clerk only once, then the CPU deletes the print data from the storage portion after printing. If the print data pertaining to printing is service-use print data for which the output result is to be repeatedly provided to customers, then the CPU continuously stores the print data in the storage portion after printing.