The system utilizes host signal processing techniques applicable to cellular communication system devices which are integrated with a system incorporating a general purpose CPU running a multitasking operating system. Data coding and entropy coding are performed with interconnection, and grouping is used to enhance coding efficiency. An internal voltage at a reference point may be determined based on the applied reference voltage, and a maximum andor minimum voltage may be determined based on the internal voltage. The keyword search results and the FAQ search results are combined in a display page. A flow resistance in the opening from one of the adjacent two flow passages to the other flow passage is different from that in the opening from the other flow passage to the one of the adjacent two flow passages.