A computer with thermoelectric conversion uses a thermoelectric conversion module that connects between a heat generating device and a low temperature device to fully utilize the redundant heat generated by the computer. The flow guide units and the flow ways communicate with each other, whereby the air can uniformly flow to every part of the air space without generating turbulence and with the air pressure unified over the air space to enhance blowing effect of the hockey table face. The protection film formed on a bottom surface of the trench is removed by turning a third introduced gas introduced into the reaction chamber into plasma. , N before so as to output the calculated results as N symbol differential phase detected signals. An output is generated based on the estimated battery SOC.