1. An augmented reality display system comprising: a data producing system that produces first position coordinates of an object; a cloud server that receives the first position coordinates produced by the data producing system; and a terminal device connectable to the cloud server through a network, wherein the terminal device includes: an imaging unit that produces image data including an image of the object and a marker based on which second position coordinates of the object in the image data are determined; a camera attitude estimating unit that estimates an attitude of the imaging unit from the image data, and determines the second coordinates of the object in the image data based on the marker; a data receiving unit that receives the first position coordinates of the object and a content associated with the first position coordinates from the cloud server; a data overlaying unit that transforms the received first position coordinates of the object to the second position coordinates of the object in the image data based on the estimated attitude of the imaging unit, and overlays the content on the image data based on the transformed position coordinates to obtain overlay image data; and a display unit that displays the overlay image data.