IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF

An image forming device and a control method thereof are provided to prevent forgery of a note by replacing a note image with various kinds of substitutive images when a printing target is the note. A storing part(140) stores a plurality of note ID information and substitutive image information corresponding to the note ID information. A controller(150) determines whether the note ID information corresponding to the recognized note is found in the storing part when a printing target is the note, and selects the substitutive image information corresponding to the note ID information of the recognized note when the note ID information corresponding to the recognized note is found. A printing unit(160) prints the selected substitutive image information. The controller selects one of the substitutive image information from the storing part when the note ID information corresponding to the recognized note is not found. An image forming device(100) updates the substitutive image information stored in the storing part. An interface unit(170) is prepared to be connected to a sever(200) through a network and supports the communication interface with the sever.