Provided are a multitasking method and apparatus. By continuously maintaining the intrinsic information of each peripheral processing unit of when a process-centered task is stopped, when a reconfigurable array stops executing the process-centered task and executes a different process-centered task, by stopping executing a control-centered task and executing a reconfiguration task, only when the reconfigurable array receives an execution request of the reconfiguration task while the reconfigurable array is performing the control-centered task, or by causing a predetermined number of processing units to execute each of a plurality of reconfiguration tasks that are to be simultaneously executed by the reconfigurable array, wherein the predetermined number of processing units is set in consideration of an expected data processing amount required for the reconfiguration task, the reconfigurable array can more quickly complete execution of multitasking.