an air conditioning control apparatus for controlling an air conditioner in a room which accommodates a computer , includes obtaining repetitively a detected value of a total power consumption of the computer and the air conditioner and a detected value of a air temperature at the air inlet , storing the obtained values into a memory , determining an approximate expression representing a relation between the total power consumption and the air temperature on the basis of the values stored into the memory , determining a value of the air temperature corresponding to the lowest value of the total power consumption , by using the calculated approximate expression , and controlling the air conditioner so that the air temperature become equal the calculated air temperature .