A refrigerator comprising: a selection unit receiving a diagnosis performance command; a control unit generating a control signal comprising product information when the selection unit receives the diagnosis performance command; a modulator generating a frequency signal according to the control signal generated by the control unit; a sound output unit outputting a sound comprising the product information by the medium of air, such that the sound is received by a portable terminal, according to the frequency signal generated by the modulator; characterized by a case forming an internal space divided into a refrigeration compartment and a freezer compartment; at least one door for opening and closing the refrigeration compartment or the freezer compartment; and at least one hinge unit supporting the door rotating thereon, wherein the hinge unit comprises a hinge housing defining a certain space over an upper side of the case, wherein the hinge housing includes: an upper surface of which inner side faces the upper side of the case; and a front surface facing in a front direction of the refrigerator and constituting the space in association with the upper surface, the front surface having a sound output hole through which the sound outputted from the sound output unit is outputted to an outside of the hinge housing, wherein the sound output unit is arranged inside the space while being suspended from the upper surface. a selection unit receiving a diagnosis performance command; a control unit generating a control signal comprising product information when the selection unit receives the diagnosis performance command; a modulator generating a frequency signal according to the control signal generated by the control unit; a sound output unit outputting a sound comprising the product information by the medium of air, such that the sound is received by a portable terminal, according to the frequency signal generated by the modulator; characterized by a case forming an internal space divided into a refrigeration compartment and a freezer compartment; at least one door for opening and closing the refrigeration compartment or the freezer compartment; and at least one hinge unit supporting the door rotating thereon, wherein the hinge unit comprises a hinge housing defining a certain space over an upper side of the case, wherein the hinge housing includes: an upper surface of which inner side faces the upper side of the case; and a front surface facing in a front direction of the refrigerator and constituting the space in association with the upper surface, the front surface having a sound output hole through which the sound outputted from the sound output unit is outputted to an outside of the hinge housing, wherein the sound output unit is arranged inside the space while being suspended from the upper surface. an upper surface of which inner side faces the upper side of the case; and a front surface facing in a front direction of the refrigerator and constituting the space in association with the upper surface, the front surface having a sound output hole through which the sound outputted from the sound output unit is outputted to an outside of the hinge housing, wherein the sound output unit is arranged inside the space while being suspended from the upper surface.