A controller causes a display device, upon receipt of an instruction designating fixed data, to display a fixed image represented by the fixed data; generates, upon receipt of an instruction designating a position for generating a first region in the fixed image, a first position information on a basis of the position designated, and stores the first position information in the storage device; acquires, upon receipt of an instruction designating a plurality of pieces of variable data, the plurality of pieces of variable data through a data input device; and causes an image forming device to form on a recording medium an image, in which a variable image represented by the variable data is inserted as replacement in the first region in each page of the fixed image, on a basis of the fixed data, the first position information, and the plurality of pieces of variable data acquired.