Using a plurality of transmission units (110, 111, 112), multicast transmission of camera images shot by a plurality of cameras (101, 102, 103) is performed by way of a network, and then, a synthesis-parameter calculation unit (105) calculates, corresponding to image processing units each, synthesis-parameters required to synthesize using the camera images display images to be displayed on respective display units (113, 114, 115, 116), and transmits the synthesis-parameters to the image processing units (106, 107, 108, 109), whereby the image processing units (106, 107, 108, 109) synthesize display images from the camera images, based on the synthesis-parameters. Synthesis processing of the display images thereby is performed being distributed to the image processing units each.
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