Control apparatus catalyst for internal combustion engine and method for controlling catalyst.

Control device as a catalyst for internal combustion engine, which performs control catalyst to a catalyst control of exhaust gas, performing a feedback control of the target air - fuel for the exhaust gas flowing into the catalyst control the exhaust gas provided in an exhaust system of the internal combustion engine based on a value detected by a detector of the stoichiometric air - fuel provided in the exhaust system of the internal combustion engine, comprising: means (46 ) for detecting the bed temperature control catalyst exhaust gas; and means (70) for reflection to obtain a degree of deviation between a target air - fuel ratio that is detected if the control catalyst in the exhaust gas is in a reference state and a value (AF) detected by the detector ( 48) of the stoichiometric air - fuel, based on the temperature (THC) of the detected bed delcatalizador control of the exhaust gas, and reflecting the obtained degree of the deviation in the catalyst control.