PROBLEM TO BE SOLVED: To provide a device capable of, even when a video configured of complicate colors or patterns is projected with extremely strong light, accurately recognizing a position marker, and appropriately displaying a virtual object.;SOLUTION: An image 31 of a position marker to be used for specifying the display position of a virtual object in an extension reality technology is acquired, and integrated into a video for projection mapping such that the video for projection mapping is completed. The video is projected to a showroom 30 by a video projection device. In this case, the image 31 of the position marker is displayed on a floor surface 32 of the showroom 30. When the showroom 30 is photographed by the portable terminal 11, predetermined virtual furniture 35 is displayed at the position of the image 31 of the position marker on a display monitor 16 of the portable terminal 11.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2017,JPO&INPIT
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