Various embodiments of the present invention relate to an electronic device and method thereof for outputting audio data, wherein the electronic device comprises: an audio module for outputting, to at least one of a plurality of sound output devices, at least one of at least one piece of first audio data having a designated format or at least one piece of second audio data having a format different from the designated format; a processor; and a memory, wherein the memory may store instructions which, when executed, enable the processor to, in response to being set to output, through a first sound output device for outputting audio data of the designated format, at least one of the at least one piece of first audio data or the at least one piece of second audio data, mix (hereinafter, first-mix) the at least one piece of second audio data, convert the first-mixed audio data into the designated format, mix (hereinafter, second-mix) the at least one piece of first audio data and the audio data converted into the designated format, post-process the second-mixed audio data; and transmit the post-processed audio data to the audio module to be output through the first sound output device. Various other embodiments are possible.