The present invention provides a data processing apparatus having a programmable logic and a method for controlling the apparatus. If it is determined that the reconfiguration of the programmable logic is necessary, register setting data for reconfiguring the programmable logic is supplied to the programmable logic. The programmable logic reads out circuit information from a memory storing the circuit information in accordance with the register setting data and reconfigures a function of the programmable logic. A CPU transfers the register setting data to the programmable logic and then transfers data to be processed by the programmable logic whose function has been reconfigured, to the programmable logic.