There is provided a data change device that includes a storage unit that stores a manipulation explanation data set and a result explanation data set related to each other, the manipulation explanation data set including at least an instruction acceptance image indicating an instruction acceptance unit for accepting an instruction to the data change device or an external device and a manipulation explanation image for explaining a manipulation of the instruction acceptance unit, and the result explanation data set indicating a phenomenon that results from a manipulation indicated by the manipulation explanation data set, a change acceptance unit that accepts a change to be made to the instruction acceptance unit, and a manipulation explanation data change unit that changes the manipulation explanation data set in accordance with the change if the change is accepted by the change acceptance unit.