Patent ID: 8086704

Claim:
A projection system having two or more projectors and a computing system interconnected through a network with each other, each of said projectors comprises: a display presence/absence checker that determines whether the projector is projecting an image, an identifier display that displays a received assigned identifier of the projector if the display presence/absence checker determines that the projector is not projecting an image, a preview image generator that generates a preview image based on a projected image if the display presence/absence checker determines that the projector is projecting an image, and generates a preview image based on the displayed assigned identifier if the display presence/absence checker determines that the projector is not projecting an image, and a preview image transmitter that transmits said preview image to said computing system through said network; and said computing system comprises: a projector search section that acquires projector information including whether each of the two or more projectors is currently projecting an image, an identifier assigning section configured to transmit an identifier assignment to one or more of the two or more projectors, the identifier assigning section only transmitting the identifier to a projector not currently projecting an image, a preview image requesting section that receives said preview image from each of said two or more projectors through said network, and a dialog display section that, upon selection of a projector from a list, displays a corresponding preview image.