Barcode display device, operation method and a program for the bar code display device

The present invention also bar code display screen is duplicated by a third party, to provide a method that makes it difficult to over-the-counter use of the replicated bar code. A bar code display device 0200, and bar code information acquiring unit 0201 acquires the barcode information which is information for displaying a bar code, change over time colors, shapes, patterns, or combinations thereof an output display change information obtaining unit 0202 obtains the information in a display change information for outputting a is changed view display, and a bar code based on the acquired barcode information, based on the acquired display change information changes that It includes a display output unit 0203 that outputs the display in the same screen, a. .The