A wireless communication device includes an equalizer configured to adjust a frequency characteristic of a user audio signal on the basis of a predetermined gain setting and to generate an adjusted signal, or an adjusted audio signal; an encoder configured to encode the adjusted signal with a preset scheme to generate an encoded signal; a decoder configured to decode the encoded signal to generate a decoded signal; a sound quality evaluator configured to carry out a PESQ evaluation of the decoded signal and to generate an evaluation result with the user audio signal serving as a reference signal for evaluation; and a selector configured to change the gain setting and to select a gain setting yielding a high evaluation result.