To control turbulence of A/F(the air-fuel ratio) in relation to the steep and complicated accelerating operation.

In an ECU(electronic control unit) 20, intake air pressure as load of an internal combustion engine 1 is estimated according to the mean acceleration opening in which the change of the acceleration opening AP detected by an accelerator opening sensor 9 is smoothed, the throttle opening of a throttle valve 3 is controlled on the basis of the estimated intake air pressure, and the air amount is supplied to the internal combustion engine 1. The fuel amount proportional to the estimated intake air pressure is calculated, the fuel injection time of an injector 17 is controlled, and the fuel amount is supplied to the internal combustion engine 1. Therefore, since the suitable air amount and fuel amount are supplied to the internal combustion engine 1, turbulence of A/F can be restrained even if the accelerating operation is the steep and complicate behavior.