A display control apparatus controlling display of a transmissive display which includes a screen configured to transmit light arriving from an object located on a side of a first surface of the transmissive display so that the object is viewable from a viewpoint position set on a side of a second surface of the transmissive display which is an opposite surface to the first surface and which stereoscopically displays a display object , comprising: an acquisition unit that acquires position information indicating a relative positional relation between the transmissive display and the object ; and a display control unit configured to change, in accordance with a change in the relative positional relation in the position information, a depth of the display object from the screen perceived from the viewpoint position , the display object being stereoscopically displayed by the transmissive display , characterized in that the display control unit is further configured to: not change the depth when a relative position of the object with respect to the transmissive display in the position information is not changed by a predetermined distance, wherein the acquisition unit additionally acquires a first distance between the transmissive display and a person or a part of a body of the person, and cause a collision prevention object , which informs the person located on the side of the second surface of the transmissive display of the presence of the transmissive display , to be displayed in accordance with the first distance to make the person located on the side of the second surface aware of the presence of the transmissive display . an acquisition unit that acquires position information indicating a relative positional relation between the transmissive display and the object ; and a display control unit configured to change, in accordance with a change in the relative positional relation in the position information, a depth of the display object from the screen perceived from the viewpoint position , the display object being stereoscopically displayed by the transmissive display , characterized in that the display control unit is further configured to: not change the depth when a relative position of the object with respect to the transmissive display in the position information is not changed by a predetermined distance, wherein the acquisition unit additionally acquires a first distance between the transmissive display and a person or a part of a body of the person, and cause a collision prevention object , which informs the person located on the side of the second surface of the transmissive display of the presence of the transmissive display , to be displayed in accordance with the first distance to make the person located on the side of the second surface aware of the presence of the transmissive display . not change the depth when a relative position of the object with respect to the transmissive display in the position information is not changed by a predetermined distance, wherein the acquisition unit additionally acquires a first distance between the transmissive display and a person or a part of a body of the person, and cause a collision prevention object , which informs the person located on the side of the second surface of the transmissive display of the presence of the transmissive display , to be displayed in accordance with the first distance to make the person located on the side of the second surface aware of the presence of the transmissive display . <EOS>