An electronic device comprising: at least one speaker (580, 1581, 1583, 1584, 1585, 1586) and a processor, wherein the processor is configured to: obtain sound source data; identify a processing capability of the processor; determine a first designated frequency band based on the processing capability of the processor, wherein the first designated frequency band is determined to be a first range of frequencies if the processing capability is a first processing capability, and determined to be a second range of frequencies broader than the first range if the processing capability is lower than the first processing capability; obtain first sound source data (713, 811) corresponding to the first designated frequency band from the sound source data by using a high-pass filter; generate second sound source data (714, 810) by down-sampling the sound source data, wherein the second sound source data (714, 810) corresponds to a frequency band of the sound source data other than the first designated frequency band; generate third sound source data by applying a sound effect to the second sound source data (714, 810) generated by down-sampling the sound source data; and generate synthesized sound source data based on the first sound source data (713, 811) and the third sound source data. at least one speaker (580, 1581, 1583, 1584, 1585, 1586) and a processor, wherein the processor is configured to: obtain sound source data; identify a processing capability of the processor; determine a first designated frequency band based on the processing capability of the processor, wherein the first designated frequency band is determined to be a first range of frequencies if the processing capability is a first processing capability, and determined to be a second range of frequencies broader than the first range if the processing capability is lower than the first processing capability; obtain first sound source data (713, 811) corresponding to the first designated frequency band from the sound source data by using a high-pass filter; generate second sound source data (714, 810) by down-sampling the sound source data, wherein the second sound source data (714, 810) corresponds to a frequency band of the sound source data other than the first designated frequency band; generate third sound source data by applying a sound effect to the second sound source data (714, 810) generated by down-sampling the sound source data; and generate synthesized sound source data based on the first sound source data (713, 811) and the third sound source data. obtain sound source data; identify a processing capability of the processor; determine a first designated frequency band based on the processing capability of the processor, wherein the first designated frequency band is determined to be a first range of frequencies if the processing capability is a first processing capability, and determined to be a second range of frequencies broader than the first range if the processing capability is lower than the first processing capability; obtain first sound source data (713, 811) corresponding to the first designated frequency band from the sound source data by using a high-pass filter; generate second sound source data (714, 810) by down-sampling the sound source data, wherein the second sound source data (714, 810) corresponds to a frequency band of the sound source data other than the first designated frequency band; generate third sound source data by applying a sound effect to the second sound source data (714, 810) generated by down-sampling the sound source data; and generate synthesized sound source data based on the first sound source data (713, 811) and the third sound source data.