The operation modes of plural intake valves 7a and 7b provided in one cylinder is independently changed according to the drive region of the internal combustion engine. When an operation unit is operated while the first screen is displayed, the transmission control unit transmits a result representing the operation to the operation unit and an identifier identifying the display instruction. Using the identification number, the print data corresponding to the transmitted electronic data can be accessed. The method disclosed includes inverting the tube such that the indicator drops to the bottom of the tube and freezing the device at the appropriate temperature level.