NOVELTY - An electrolytic hydrogen production system (10) has alternating current-direct current (AC-DC) conversion part (4) which converts alternating current (AC) power from a rotating equipment into direct current (DC) power for hydrogen generation by electrolysis using electrolytic hydrogen production apparatus (5), tables, calculating parts, electrolysis addition part which adds the standard electrolytic voltage and the correction electrolytic voltage, and calculates the target electrolytic voltage for electrolysis, and voltage control part which controls the AC-DC conversion part.    USE - An electrolytic hydrogen production system.    ADVANTAGE - Stabilization of electric power generation and high efficiency power generation are obtained.    DETAILED DESCRIPTION - An electrolytic hydrogen production system (10) has alternating current-direct current (AC-DC) conversion part (4) which converts alternating current (AC) power from a rotating equipment which is rotated by wind force to produce electric power into direct current (DC) power for hydrogen generation by electrolysis using electrolytic hydrogen production apparatus (5), 1st table showing the relationship between the wind force applied to the rotating equipment, and the AC power from the rotation speed of the rotating equipment, 2nd table showing the relationship between the electrolytic voltage for electrolysis by the electrolytic hydrogen production apparatus, and the electric power consumed by the electrolysis, input part where the measured wind force applied to the rotating equipment, and the measured rotation speed of the rotating equipment are input, 1st calculating part which calculates the target rotation speed of the rotating equipment, and the target AC power from the rotating equipment based on 1st table and measured wind force, 2nd calculating part which calculates the standard electrolytic voltage as the electrolytic voltage for the electrolysis based on 2nd table and target alternating current power, 3rd calculating part which calculates the correction electrolytic voltage for correction of the standard electrolytic voltage based on the difference of the measurement rotation speed and the target rotation speed, electrolysis addition part which adds the standard electrolytic voltage and the correction electrolytic voltage, and calculates the target electrolytic voltage for electrolysis by electrolytic hydrogen production apparatus, and voltage control part which controls the AC-DC conversion part so the voltage in the DC power converted in the AC-DC conversion part corresponds to the target electrolytic voltage. INDEPENDENT CLAIMS are included for:    (1) electrolytic hydrogen production method; and    (2) computer program for electrolytic hydrogen production.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the structure of electrolytic hydrogen production system. (Drawing includes non-English language text).    Windmill (1)    Air velocity meter (2)    Rotation speed meter (3)    AC-DC converter (4)    Water electrolysis hydrogen generating apparatus (5)    Electrolytic hydrogen production system (10)