A data processing apparatus stops a supply of data to a buffer when the buffer becomes full, and thereafter performs processing such as moving to a low-power mode and switching execution tasks. The data processing apparatus then reverts from the low-power mode and resumes execution of a task for supplying data to the buffer when a predetermined reversion condition is satisfied. The predetermined reversion condition is that, for example, processing with respect to data in a predetermined data cluster is completed, a predetermined time period has elapsed, or a cycle handler notifies an event occurrence.