Control method of a printing apparatus in selling points systems

摘要

In a method of controlling a printing apparatus (50) which performs printing by adding image data already stored in the printing apparatus to payment transaction print data generated on the basis of input information concerning merchandise sales, a predetermined character string indicating a print position of the image data is retrieved from the payment transaction print data and the predetermined character string is extracted. A line number specified by the extracted predetermined character string is obtained and an image addition setting command is generated on the basis of the line number. The payment transaction print data and the image addition setting command are transmitted to the printing apparatus (50). Even if a low-speed interface is used as an interface between a PC (40) and the printing apparatus (50), the image data can be printed rapidly.