1. An information processing device, comprising: a central processing unit (CPU) configured to: receive, from an image pickup device, first image information of a first image, wherein the first image is captured by the image pickup device; receive, from a display device that has been captured by the image pickup device to generate the first image, second image information of a second image that is displayed on the display device; detect, based on the first image information and the second image information, whether the second image is contained in the first image; detect a position of the second image in the first image and a posture of the second image in the first image, based on the detection that the second image is contained in the first image; and transmit, to the image pickup device, third information that comprises the detected position of the second image in the first image and the detected posture of the second image in the first image, wherein the image pickup device displays a virtual image corresponding to the second image based on the third information.