Patent ID: 8171400

Claim:
An image transmission apparatus to which a plurality of image projection apparatuses are connectable, comprising: a display device configured to display a plurality of content elements; a display image data generator configured to generate display image data of each content element, at least a part of which is displayed on the display device; a storage device configured to store the display image data in a storage location corresponding to a projection position of an image projected by each of the connected image projection apparatuses; a storage controller configured to store the correspondence relationship between each of the connected image projection apparatuses and each of the generated display image data in the storage device; a transmitter configured to transmit each of the corresponding display image data to each of the connected image projection apparatuses; and a display controller configured to: display a plurality of primary display images on a primary screen of the display device using the display image data, display a plurality of layout display images corresponding to the plurality of primary display images in a layout display region on the display device, the layout display region occupying an area smaller than the primary screen, and change the layout of the plurality of layout display images in the layout display region independently of the plurality of primary display images in response to an operation of changing the layout of the plurality of layout display images; wherein projected images displayed by the connected image projection apparatuses are displayed in accordance with the layout of the plurality of layout display images in the layout display region.