NOVELTY - A feedback calculator calculates the temperature of a heater (6) from preset and measured temperature of a catalyst (5). A feed forward calculator calculates the amount of compensation of the temperature variation of the catalyst based on stored fluctuation factor. A temperature calculator uses the compensation amount and the output of feedback calculator to calculate heater temperature.    USE - For storing and supplying hydrogen to thermal power generation plant and nuclear power generation plant.    ADVANTAGE - Stabilizes the temperature of the catalyst, thereby ensuring stable supply or storage of hydrogen.    DETAILED DESCRIPTION - A reaction container (2) includes a temperature sensor (7) for measuring temperature of the catalyst required for hydrogenation or de-hydrogenation and the heater for heating the catalyst. A nozzle (3) supplies hydrogen containing material to the surface of the catalyst and a pulse generation circuit (4) supplies pulse for controlling operation of a valve (3a) connected to the nozzle. A random access memory (RAM) (13) stores information on temperature fluctuation factor of the catalyst, supply quantity of hydrogen containing material, the type of material or the type of catalyst . A temperature setting unit (10) sets the temperature of the catalyst. The feedback calculator calculates the temperature of the heater from preset temperature and measured catalyst temperature. The feed forward calculator calculates the amount of compensation of the temperature variation of the catalyst by multiplying volume or thermal capacity of the reaction container to stored fluctuation factor. The temperature calculator uses the compensation amount and the output of feedback calculator to calculate heater temperature.    INDEPENDENT CLAIMS are also included for the following:    (1) temperature control apparatus; and    (2) temperature control method.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the hydrogen supply and storage system.    reaction container (2)    nozzle (3)    valve (3a)    pulse generation circuit (4)    catalyst (5)    heater (6)    temperature sensor (7)    temperature setting unit (10)    RAM (13)