A head-mounted display, comprising: a display unit that is configured to be mountable on a head of a user and is configured both to enable the user to see through such as to have an external field of view of a real space, wherein the user can gaze at targets (A1, A2, A3, A4) in the real space, and to display images of objects (B1, B2, B3, B4) that are related to said targets (A1, A2, A3, A4) in the real space, in a display region that is limited with respect to the field of view and thus occupies a portion of the field of view; a detector that is configured to detect an azimuth of the display unit around a vertical axis; and a region limiter that is configured to limit said display region of the field of view along a direction of the vertical axis in three-dimensional coordinates surrounding the display unit; a storage unit that is configured to store images configured to be displayed in the field of view with the images being made corresponding to the three-dimensional coordinates; and a display control unit that is configured to display, based on an output of the detector, an image in the three-dimensional coordinates, which corresponds to the azimuth, in the field of view, wherein the display control unit is configured to display in the display region only those images that correspond to the detected azimuth, and the region limiter is configured to limit the display region in a height direction in cylindrical coordinates around the vertical axis in accordance with a region of the field of view in a vertical direction to a height such that those images stored in the storage unit that correspond to the detected azimuth are displayed in the display region wherein the region limiter, the storage unit, and the display control unit constitute a first control unit, and characterized in that the first control unit is configured to limit, when an input of a predetermined signal generated according to an operation of the user is detected, a region in the height direction in the three-dimensional coordinates in accordance with a region of the field of view in the direction of the vertical axis, and to adjust all the images of objects related to targets that correspond to the detected azimuth to the same height in the field of view (v) such that the user can view the different objects only by changing the attitude around the vertical axis, the first control unit being configured to display images of objects in the display region that are related to targets (A1, A2, A3, A4) having a vertical height such that these targets are not present in the field of view. a display unit that is configured to be mountable on a head of a user and is configured both to enable the user to see through such as to have an external field of view of a real space, wherein the user can gaze at targets (A1, A2, A3, A4) in the real space, and to display images of objects (B1, B2, B3, B4) that are related to said targets (A1, A2, A3, A4) in the real space, in a display region that is limited with respect to the field of view and thus occupies a portion of the field of view; a detector that is configured to detect an azimuth of the display unit around a vertical axis; and a region limiter that is configured to limit said display region of the field of view along a direction of the vertical axis in three-dimensional coordinates surrounding the display unit; a storage unit that is configured to store images configured to be displayed in the field of view with the images being made corresponding to the three-dimensional coordinates; and a display control unit that is configured to display, based on an output of the detector, an image in the three-dimensional coordinates, which corresponds to the azimuth, in the field of view, wherein the display control unit is configured to display in the display region only those images that correspond to the detected azimuth, and the region limiter is configured to limit the display region in a height direction in cylindrical coordinates around the vertical axis in accordance with a region of the field of view in a vertical direction to a height such that those images stored in the storage unit that correspond to the detected azimuth are displayed in the display region wherein the region limiter, the storage unit, and the display control unit constitute a first control unit, and characterized in that the first control unit is configured to limit, when an input of a predetermined signal generated according to an operation of the user is detected, a region in the height direction in the three-dimensional coordinates in accordance with a region of the field of view in the direction of the vertical axis, and to adjust all the images of objects related to targets that correspond to the detected azimuth to the same height in the field of view (v) such that the user can view the different objects only by changing the attitude around the vertical axis, the first control unit being configured to display images of objects in the display region that are related to targets (A1, A2, A3, A4) having a vertical height such that these targets are not present in the field of view.