NOVELTY - Method of reforming carbon-containing fuel and steam to produce reformed hydrogen rich fuel comprises fuel reforming/carbon dioxide separation step, absorbent regeneration/heat storage step and cooling/fuel reforming step.    USE - For reformed hydrogen rich fuel from carbon-containing fuel and steam.    ADVANTAGE - The method is capable of obtaining high conversion degree of relatively low temperatures in a steam reforming reaction. It is capable of obtaining reformed fuel having high hydrogen purity.    DETAILED DESCRIPTION - Method of reforming carbon-containing fuel and steam to produce reformed hydrogen rich fuel comprises:    (1) fuel reforming/carbon dioxide separation step that comprises:    (a) adding carbon-containing fuel and steam to a reactor filled with a fuel reforming catalyst which promotes a fuel reforming reaction to produce carbon dioxide (CO2) and hydrogen;    (b) adding a CO2 absorbant, capable of irreversibly absorbing and discharging carbon dioxide; and    (c) setting CO2 absorbent at an absorption temperature, to convert the carbon-containing fuel into reformed fuel, and separating CO2 from reformed fuel by allowing CO2 absorbent to absorb CO2;    (2) absorbent regeneration/heat storage step that comprises:    (a) obtaining a product gas by oxidizing portion(s) of reformed fuel and the carbon-containing fuel with an oxidizer;    (b) heating the CO2 absorbent with the product gas to regenerate the CO2 absorbent and store heat in CO2 absorbent; and    (3) cooling/fuel reforming step that comprises;    (a) supplying carbon-containing fuel and steam to reactor in which the absorbent regeneration/heat storage step is completed, cooling, to the absorption temperature, the CO2 absorbent heated to the regeneration temperature; and    (b) converting carbon-containing fuel into reformed fuel by heat energy stored in the carbon dioxide absorbent.    An INDEPENDENT CLAIM is included for a fuel reforming system comprising material supplier for supplying the carbon-containing fuel and steam to a reactor filled with catalyst and a carbon dioxide absorbent, heater for obtaining a product gas by oxidizing at least one of a portion of the reformed fuel and the carbon-containing fuel with an oxidizer, and heating the carbon dioxide absorbent to a regeneration temperature with this product gas and    switch for switching the material supplier and heater to be used.