A Solid Oxide Fuel Cell (SOFC) has a wide scope of operating temperature from 500 to 1,000℃, does not require any complex device which circulates carbon dioxide as in the case of Molten Carbonate Fuel Cell (MCFC) and does not have a problem of corrosive electrolyte continuously corrosion electrodes and other parts in high temperature. In this study, we composed a simulated gas by examining the data of biogas composition and studied electrical characteristics of SOFC. Also, we compared electrical characteristics of SOFC using methane and hydrogen. The result of measuring the electric characteristics of fuel cell using only hydrogen showed 1.05 V output when the current was 0.1 A. As to the electric characteristic of the fuel cell measured using simulated gases, the biogas of Asan-si environment center which was investigated to contain the biggest content of methane showed the highest value of 0.95 V (current 0.1 A) and Suncheon manure biogas which has low content of methane and high content of carbon dioxide showed the lowest value of 0.75 V (current 0.1 A).