A body fat measuring method of a mobile device includes inputting a predetermined intensity of current to an object via a first electrode in contact with a first surface of the object and a second electrode in contact with a second surface of the object, wherein the first and second electrodes are included in the mobile device measuring a voltage between a third electrode and a fourth electrode that are included in the mobile device acquiring impedance information of the object, based on the applied predetermined intensity of current and an intensity of the measured voltage and acquiring body fat information of the object, based on the impedance information.
