A method of manufacturing a light emitting device is provided which requires low cost, is easy, and has high throughput. In particular, the invention conducts an auction-like phone call handling process in which phone handling decisions are partially delegated from a central resource to the individual client agents. Earth electrodes connected to the other ends of the center electrodes and arranged between center electrodes at least one by one are provided. A command is received in response to a prescribed number of actions input by the user to the operational input.