A network image-synthesis display system, comprising: a plurality of cameras (101, 102, 103); a plurality of transmission units (110, 111, 112) provided corresponding to the cameras (101, 102, 103), for performing by way of a network, multicast transmission of camera images being shot by the cameras (101, 102, 103); a plurality of image processing units (106, 107, 108, 109) for receiving the camera images, and for synthesizing their respective display images from the camera images; a plurality of display units (113, 114, 115, 116) provided corresponding to the image processing units (106, 107, 108, 109), for displaying said display images wherein each of the image processing units (106, 107, 108, 109) is so arranged that only a display image to be displayed on one of the display units (113, 114, 115, 116) undergoes synthesis processing; and a synthesis-parameter calculation unit for calculating, corresponding to each of the image processing units (106, 107, 108, 109), a synthesis-parameter composed of an image-selection parameter designating a combination among the camera images from the plurality of transmission units (110, 111, 112) and an image processing parameter specifying contents of image-synthesis processing, and for transmitting by way of the network the synthesis-parameter to the image processing units (106, 107, 108, 109); wherein the image processing units (106, 107, 108, 109) each perform, based on the image-processing parameter, the synthesis processing of camera images, among those from the transmission units (110, 111, 112), designated by the image-selection parameter, to produce said display images, whereby the synthesis processing of said display images is performed being distributed to the plurality of image processing units (106, 107, 108, 109), characterized in that the synthesis-parameter calculation unit is further configured for calculating, corresponding to each of the image processing units (106, 107, 108, 109), an image-compensation parameter for compensating a displacement between each of the camera images of the designated combination so that common portions of the camera images of the designated combination can be overlapped without causing displacement, wherein the image processing parameter contains an image-transformation parameter that can be expressed by a transformation matrix that can be calculated from the image-compensation parameter for mapping points in the camera images to corresponding points in a display region. a plurality of cameras (101, 102, 103); a plurality of transmission units (110, 111, 112) provided corresponding to the cameras (101, 102, 103), for performing by way of a network, multicast transmission of camera images being shot by the cameras (101, 102, 103); a plurality of image processing units (106, 107, 108, 109) for receiving the camera images, and for synthesizing their respective display images from the camera images; a plurality of display units (113, 114, 115, 116) provided corresponding to the image processing units (106, 107, 108, 109), for displaying said display images wherein each of the image processing units (106, 107, 108, 109) is so arranged that only a display image to be displayed on one of the display units (113, 114, 115, 116) undergoes synthesis processing; and a synthesis-parameter calculation unit for calculating, corresponding to each of the image processing units (106, 107, 108, 109), a synthesis-parameter composed of an image-selection parameter designating a combination among the camera images from the plurality of transmission units (110, 111, 112) and an image processing parameter specifying contents of image-synthesis processing, and for transmitting by way of the network the synthesis-parameter to the image processing units (106, 107, 108, 109); wherein the image processing units (106, 107, 108, 109) each perform, based on the image-processing parameter, the synthesis processing of camera images, among those from the transmission units (110, 111, 112), designated by the image-selection parameter, to produce said display images, whereby the synthesis processing of said display images is performed being distributed to the plurality of image processing units (106, 107, 108, 109), characterized in that the synthesis-parameter calculation unit is further configured for calculating, corresponding to each of the image processing units (106, 107, 108, 109), an image-compensation parameter for compensating a displacement between each of the camera images of the designated combination so that common portions of the camera images of the designated combination can be overlapped without causing displacement, wherein the image processing parameter contains an image-transformation parameter that can be expressed by a transformation matrix that can be calculated from the image-compensation parameter for mapping points in the camera images to corresponding points in a display region.