An apparatus controls a circuit having rewritable processor elements and includes an acquiring unit that acquires information concerning a first task under execution by the circuit; a reading unit that, when the information concerning the first task is acquired, reads from a memory, a completion time of the first task; a first calculating unit that calculates a deadline time using the read completion time; an identifying unit that refers to scheduling information in the memory and identifies for a second task, the quantity of processor elements to be rewritten by the deadline time; a second calculating unit that divides the identified quantity of the processor elements by the deadline time to calculate the quantity of processor elements to be rewritten per unit time; and an executing unit that causes the circuit to rewrite the processor elements for the second task, in the quantity per unit time calculated.