NOVELTY - A fuel reforming apparatus comprises two catalysts, a fuel feeder, two oxidizer feeders, an oxidizer control valve, steam feeders, and a master controller.    USE - For fuel cells.    ADVANTAGE - The fuel reforming apparatus is capable of quickly heating a catalyst to an activation temperature and shortening a start up time.    DETAILED DESCRIPTION - A fuel reforming apparatus comprises a first catalyst (1) with a support, for promoting a steam reforming reaction and a partial oxidation reaction; a second catalyst (2) with a support positioned upstream from the first catalyst, for promoting the partial oxidation reaction; a fuel feeder (3) for feeding a hydrocarbon as a fuel upstream from the second catalyst; a first oxidizer feeder (4) for feeding the oxidizer to the first catalyst; a second oxidizer feeder (5) for feeding the oxidizer to the second catalyst; an oxidizer control valve (6) for selectively supplying the oxidizer from an oxidizer source to one of the first and second oxidizer feeder; a first steam feeder (7) for feeding steam to the first catalyst; a second steam feeder (8) for feeding steam to the second catalyst; a steam controller for selectively supplying steam from a steam source to one of the feeder; and a master controller (10) for controlling the oxidizer controller and steam controller. The master controller has first and second states, to control the oxidizer controlling and steam controller in such a manner as to connect, in the first state, the oxidizer source to the second oxidizer feeder and the steam source to the first steam feeder, and in the second state, the oxidizer source to the first oxidizer feeder and the steam source to the second steam feeder. The master controller is in the first state during startup and transient operations and is in the second state during the other operations.    DESCRIPTION OF DRAWING(S) - The figure is a sectional view of the fuel reforming apparatus.    Catalysts (1, 2)    Fuel feeder (3)    Oxidizer feeders (4, 5)    Oxidizer control valve (6)    Steam feeders (7, 8)    Master controller (10)