1. A user interface method of a hybrid device, the hybrid device including a plurality of task-handlers corresponding to a common function key of an input unit, the task-handlers being controlled by operation of the common function key of the input unit, the user interface method comprising: receiving information to change priorities of the task-handlers from the input unit by a user to the hybrid device; changing the priorities of the task-handlers in the hybrid device, based on the received information; and storing information regarding the changed priorities in the hybrid device according to an application type indicating whether the changed priorities are to be applied once, are to be applied permanently, or are to be set to a default setting, wherein: the hybrid device is configured to simultaneously perform a plurality of recording and/or reproducing functions by simultaneously recording data to and/or reproducing data from at least one non-transitory information storage medium; each of the task-handlers of the hybrid device controlled by the operation of the common function key controls a different one of the plurality of recording and/or reproducing functions of the hybrid device; and the priorities of the task-handlers of the hybrid device relate to an order in which the task-handlers are individually and selectively controlled by the operation of the common function key.