An embodiment of the present invention comprises: a communication module for communicating with at least one external device; a microphone for receiving a user utterance; a memory for storing performance mode information having been configured in the electronic device; and a processor electrically connected to the communication module, the microphone, and the memory, wherein the processor is configured to: receive, through the microphone, a second user utterance associated with task execution; transmit first data associated with the second user utterance to an external device; receive, from the external device, second data associated with at least a part of processing of the first data; identify a first work load allocated to the electronic device at the time of receiving the second data; and compare a second work load required for processing the second data and the first work load, so as to control the performance mode. In addition, various embodiments recognized through the specification are possible.