An electronic device comprising: a memory configured to store profile information; at least one first electrode; at least one second electrode; and a processor electrically connected to the at least one first electrode and the at least one second electrode, wherein the processor is configured to: determine a frequency of at least one among at least three signals for measuring body composition, based on the profile information; output a synthesis signal to a body through the at least one first electrode, the synthesis signal being obtained by synthesizing the at least three signals, wherein the synthesis signal includes a signal corresponding to the determined frequency and the at least three signals each have different frequencies; receive the synthesis signal passing through the body, through the at least one second electrode; measure body impedance based on the received synthesis signal; and determine the body composition based on the body impedance; wherein the processor is configured to measure a skin contact impedance based on the synthesis signal, and to remove the skin contact impedance from the body impedance; wherein the synthesis signal includes at least three first signals, each of the at least three first signals having different frequencies in a first frequency range, and at least three second signals, each of the at least three second signals having different frequencies in a second frequency range, the second frequency range being smaller than the first frequency range; wherein the processor is configured to measure the skin contact impedance using the at least three second signals. a memory configured to store profile information; at least one first electrode; at least one second electrode; and a processor electrically connected to the at least one first electrode and the at least one second electrode, wherein the processor is configured to: determine a frequency of at least one among at least three signals for measuring body composition, based on the profile information; output a synthesis signal to a body through the at least one first electrode, the synthesis signal being obtained by synthesizing the at least three signals, wherein the synthesis signal includes a signal corresponding to the determined frequency and the at least three signals each have different frequencies; receive the synthesis signal passing through the body, through the at least one second electrode; measure body impedance based on the received synthesis signal; and determine the body composition based on the body impedance; wherein the processor is configured to measure a skin contact impedance based on the synthesis signal, and to remove the skin contact impedance from the body impedance; wherein the synthesis signal includes at least three first signals, each of the at least three first signals having different frequencies in a first frequency range, and at least three second signals, each of the at least three second signals having different frequencies in a second frequency range, the second frequency range being smaller than the first frequency range; wherein the processor is configured to measure the skin contact impedance using the at least three second signals. determine a frequency of at least one among at least three signals for measuring body composition, based on the profile information; output a synthesis signal to a body through the at least one first electrode, the synthesis signal being obtained by synthesizing the at least three signals, wherein the synthesis signal includes a signal corresponding to the determined frequency and the at least three signals each have different frequencies; receive the synthesis signal passing through the body, through the at least one second electrode; measure body impedance based on the received synthesis signal; and determine the body composition based on the body impedance; wherein the processor is configured to measure a skin contact impedance based on the synthesis signal, and to remove the skin contact impedance from the body impedance; wherein the synthesis signal includes at least three first signals, each of the at least three first signals having different frequencies in a first frequency range, and at least three second signals, each of the at least three second signals having different frequencies in a second frequency range, the second frequency range being smaller than the first frequency range; wherein the processor is configured to measure the skin contact impedance using the at least three second signals. wherein the processor is configured to measure a skin contact impedance based on the synthesis signal, and to remove the skin contact impedance from the body impedance; wherein the synthesis signal includes at least three first signals, each of the at least three first signals having different frequencies in a first frequency range, and at least three second signals, each of the at least three second signals having different frequencies in a second frequency range, the second frequency range being smaller than the first frequency range; wherein the processor is configured to measure the skin contact impedance using the at least three second signals.