A system for outputting a work instruction, in which an image processing device that takes a picture of a photographic subject is connected to an output device is disclosed. The system includes an imaging unit that generates image data showing the picture of the photographic subject; an obtaining unit that obtains determination data used for determining whether a work process performed on the photographic subject is completed; an input unit that inputs reference material data indicating reference materials used for reference in the work process; a determination unit that determines whether the work process performed on the photographic subject is completed, the determination being made depending on whether the photographic subject in the image data is in a state indicated by the determination data; and an output unit that outputs, to the output device, reference material data for a work process specified in accordance with the determination.