PURPOSE: To increase power generating capacity by bringing gas from a methanol reforming reactor into contact with prescribed adsorbents, separating adsorbed CO and CO2 selectively, and sending refined gas to a fuel cell.

CONSTITUTION: When methanol reformed gas obtained from a methanol reforming reactor 1 is brought into contact with zeolite and activated carbon under high pressure, due to difference in adsorbing capacity between H2, CO and CO2, CO is adsorbed mainly to the zeolite, and CO2 is adsorbed selectively to the activated carbon, and H2 is refined as H2 having high purity. Meanwhile, CO and CO2 adsorbed to the zeolite and the activated carbon are separated by lowering the pressure. Thereby, in the case adsorbing towers 15A and 15B filled with adsorbents of the zeolite and the activated carbon are arranged side by side by two or more systems and adsorption and separation are repeated alternately, H2 having high purity can be obtained continuously.