A method of estimating a profit margin for an IC chip includes providing design, manufacturing and financial input data for the IC chip and determining a ratio of performing to manufactured IC chips using chip yields apart from timing. The apparatus controls display of the screen for manipulating substrate processing information and includes a part to which an external storage device is attached. The difference data detection process makes a processor core section sequentially detect difference data between the current image macro block data sequentially transferred to the second internal memory and the reference image macro block data stored in the second internal memory. The coupling member may be configured to bear against a top surface of the flexible circuit so that pads on a bottom surface of the flexible circuit rest against pads on a top surface of the rigid circuit.