PURPOSE: To provide the document editing device which displays the same image as a print result on the screen of a display means.

CONSTITUTION: When inputted document data 7 are displayed as an image, image pattern data on a thin line with one-dot thickness, a thick line with two-dot thickness, and a double line with one-dot thickness and a 16-dot interval between lines which are read out of an image pattern storage part 2 by a print data control part 3 are thinned out by a thinning-out processing part 5 and displayed at a display means 6. Further, when the inputted document data 7 are printed, pattern data on the thick line, thin line, and double line read out of a pattern storage part 1 by a print data control part 3 are printed at a printing means 4.