A bread maker including a pair of kneading drums inside an oven compartment, to which are attached opposite ends of a mixing bag containing bread ingredients, the kneading drums reversing rotary direction periodically; a bar code scanner to read a bar code on the mixing bag; a drum driving part rotating the kneading drums in clockwise and counterclockwise directions; a bar code reading checking part sensing whether the bar code scanner is reading the bar code; and a controller determining whether the bar code scanner is reading the bar code based upon a sensed signal output from the bar code reading checking part, and controlling the drum driving part to rotate the kneading drums at a bar code reading speed while the bar code scanner reads the bar code, and at a faster dough kneading speed when the bar code scanner has completely read the bar code.