A head mounted display, HMD, comprising: a camera unit configured to capture an image of a surrounding area of the HMD, wherein the captured image includes a three-dimensional, 3D, image; a display unit configured to display augmented reality information associated with the captured image; a communication unit configured to transmit and receive data to and from an external device (210, 220, 230, 240, 250, 260), the external device is configured to store ticket information; a sensor unit configured to sense a position of the HMD and to deliver the sensed result to a processor; and the processor configured to: control the camera unit, the display unit, the communication unit, and the sensor unit request ticket information from the external device (210, 220, 230, 240, 250, 260), receive a response including the ticket information according to the request from the external device (210, 220, 230, 240, 250, 260), extract relative position information of the external device (210, 220, 230, 240, 250, 260) with respect to the HMD based on position information of the HMD and acquired absolute position information (P1, P2) of the external device (210, 220, 230, 240, 250, 260); acquire the augmented reality information associated with the ticket information when the ticket information received from the external device (210, 220, 230, 240, 250, 260) is valid, extract depth information of at least one object included in the captured 3D image; detect an object related to the external device (210, 220, 230, 240, 250, 260) in the captured image, wherein the object related to the external device (210, 220, 230, 240, 250, 260) corresponds to one of the at least one object having depth information that matches the relative position information of the external device (210, 220, 230, 240, 250, 260); extract a borderline from the captured 3D image; recognize the detected object based on the extracted borderline to display the augmented reality information associated with the ticket information on a surrounding area of the detected object. a camera unit configured to capture an image of a surrounding area of the HMD, wherein the captured image includes a three-dimensional, 3D, image; a display unit configured to display augmented reality information associated with the captured image; a communication unit configured to transmit and receive data to and from an external device (210, 220, 230, 240, 250, 260), the external device is configured to store ticket information; a sensor unit configured to sense a position of the HMD and to deliver the sensed result to a processor; and the processor configured to: control the camera unit, the display unit, the communication unit, and the sensor unit request ticket information from the external device (210, 220, 230, 240, 250, 260), receive a response including the ticket information according to the request from the external device (210, 220, 230, 240, 250, 260), extract relative position information of the external device (210, 220, 230, 240, 250, 260) with respect to the HMD based on position information of the HMD and acquired absolute position information (P1, P2) of the external device (210, 220, 230, 240, 250, 260); acquire the augmented reality information associated with the ticket information when the ticket information received from the external device (210, 220, 230, 240, 250, 260) is valid, extract depth information of at least one object included in the captured 3D image; detect an object related to the external device (210, 220, 230, 240, 250, 260) in the captured image, wherein the object related to the external device (210, 220, 230, 240, 250, 260) corresponds to one of the at least one object having depth information that matches the relative position information of the external device (210, 220, 230, 240, 250, 260); extract a borderline from the captured 3D image; recognize the detected object based on the extracted borderline to display the augmented reality information associated with the ticket information on a surrounding area of the detected object. control the camera unit, the display unit, the communication unit, and the sensor unit request ticket information from the external device (210, 220, 230, 240, 250, 260), receive a response including the ticket information according to the request from the external device (210, 220, 230, 240, 250, 260), extract relative position information of the external device (210, 220, 230, 240, 250, 260) with respect to the HMD based on position information of the HMD and acquired absolute position information (P1, P2) of the external device (210, 220, 230, 240, 250, 260); acquire the augmented reality information associated with the ticket information when the ticket information received from the external device (210, 220, 230, 240, 250, 260) is valid, extract depth information of at least one object included in the captured 3D image; detect an object related to the external device (210, 220, 230, 240, 250, 260) in the captured image, wherein the object related to the external device (210, 220, 230, 240, 250, 260) corresponds to one of the at least one object having depth information that matches the relative position information of the external device (210, 220, 230, 240, 250, 260); extract a borderline from the captured 3D image; recognize the detected object based on the extracted borderline to display the augmented reality information associated with the ticket information on a surrounding area of the detected object.