The present invention resides in a control apparatus for an internal combustion engine in which selective use is made of a case where a first fuel, being easy to be ignited, is caused to combust by itself, and a case where a second fuel, being hard to be ignited, is also caused to combust by igniting said first fuel, and which is provided with an acquisition unit configured to acquire a combustion state of said second fuel in the case where said second fuel is also caused to combust by igniting said first fuel, and a decision unit configured to decide amounts of supply of said first fuel and said second fuel to be supplied to said internal combustion engine on and after next time, based on the combustion state of said second fuel determined by said acquisition unit.