A glasses apparatus, comprising: a first interface module which receives a synchronization signal in a first wireless communication method; a glasses frame; a first glass and a second glass mounted on the glasses frame and which are driven in synchronization with one of a plurality of contents output on a display apparatus based on the synchronization signal; a second interface module which receives audio signals of at least one content from among the plurality of contents in a second wireless communication method; a controller which selects an audio signal of said one content from among the audio signals received by the second interface module; and an audio outputter which outputs the selected audio signal of said one content, wherein the audio outputter comprises: a first sound-emitting portion which is connected to a first body portion of the glasses frame using a first wire, which comprises a first output transducer mounted therein, and which is insertable in use into a first ear of the user; a second sound-emitting portion which is connected to a second body portion of the glasses frame using a second wire, which comprises a second output transducer mounted therein, and which is insertable in use into a second ear of the user; and wherein: the first body comprises a first receiving groove which is shaped to receive the first sound-emitting portion therein; the second body comprises a second receiving groove which is shaped to receive the second sound-emitting portion therein; the first sound-emitting portion is provided with a first wire connecting portion protruding therefrom to which the first wire is connected; the second sound-emitting portion is provided with a second wire connecting portion protruding therefrom to which the second wire is connected; the first receiving groove is provided with a first wire connecting portion insert groove into which the first wire connecting portion is inserted and kept; and the second receiving groove is provided with a second wire connecting portion insert groove into which the second wire connecting portion is inserted and kept. a first interface module which receives a synchronization signal in a first wireless communication method; a glasses frame; a first glass and a second glass mounted on the glasses frame and which are driven in synchronization with one of a plurality of contents output on a display apparatus based on the synchronization signal; a second interface module which receives audio signals of at least one content from among the plurality of contents in a second wireless communication method; a controller which selects an audio signal of said one content from among the audio signals received by the second interface module; and an audio outputter which outputs the selected audio signal of said one content, wherein the audio outputter comprises: a first sound-emitting portion which is connected to a first body portion of the glasses frame using a first wire, which comprises a first output transducer mounted therein, and which is insertable in use into a first ear of the user; a second sound-emitting portion which is connected to a second body portion of the glasses frame using a second wire, which comprises a second output transducer mounted therein, and which is insertable in use into a second ear of the user; a first sound-emitting portion which is connected to a first body portion of the glasses frame using a first wire, which comprises a first output transducer mounted therein, and which is insertable in use into a first ear of the user; a second sound-emitting portion which is connected to a second body portion of the glasses frame using a second wire, which comprises a second output transducer mounted therein, and which is insertable in use into a second ear of the user; and wherein: the first body comprises a first receiving groove which is shaped to receive the first sound-emitting portion therein; the second body comprises a second receiving groove which is shaped to receive the second sound-emitting portion therein; the first sound-emitting portion is provided with a first wire connecting portion protruding therefrom to which the first wire is connected; the second sound-emitting portion is provided with a second wire connecting portion protruding therefrom to which the second wire is connected; the first receiving groove is provided with a first wire connecting portion insert groove into which the first wire connecting portion is inserted and kept; and the second receiving groove is provided with a second wire connecting portion insert groove into which the second wire connecting portion is inserted and kept. the first body comprises a first receiving groove which is shaped to receive the first sound-emitting portion therein; the second body comprises a second receiving groove which is shaped to receive the second sound-emitting portion therein; the first sound-emitting portion is provided with a first wire connecting portion protruding therefrom to which the first wire is connected; the second sound-emitting portion is provided with a second wire connecting portion protruding therefrom to which the second wire is connected; the first receiving groove is provided with a first wire connecting portion insert groove into which the first wire connecting portion is inserted and kept; and the second receiving groove is provided with a second wire connecting portion insert groove into which the second wire connecting portion is inserted and kept.