A method of forming a metal line is provided. An offset canceling section 26 calculates an average value of amplitude of a signal which should have an average of amplitude within a predetermined time range of 0, subtracts the average value from the signal and thereby removes an offset included in the signal. Creating a local sequence connection order based on the determined other nodes the node can reach in a single communication hop. In a related embodiment, users are enabled to specify the ECU programming to change, such as changing speed limiter settings. According to the present invention, a stable image is always obtained by changing a method for supplying an ink from a main tank to the subtank in accordance with an elapsed time from the end of previous printing. 1% B, 1% submicron oxide particles andor electrically insulating or electrically conductive covalent ceramic particles, 1% rare earth metal, andor 3% Cu.