Abstract: A printer/scanner unit includes a scanner for optically reading a document model and a printer to print a recording medium. The document model is transported along a transport path from a feed device to an output device of a transport device. After the scanning step, the document model is displayed on a screen and can be completed there with supplementary data, supplied, for example, by means of a data input device, such as a keyboard or a data memory. A document model which has been scanned askew, for example, can be shifted to a position which has been defined for completion with supplementary data, and can possibly be altered in size. It is foreseen that then only the data with which the document model on the screen is to be completed are transmitted to the printer, and the supplementary data are printed on the original of the document model, which was previously scanned.