The easiest way is to use a screen divider to view the images of multiple HDTV cameras on one monitor.
Sold by several companies, the price will be around 100,000 yen.
■ Divider of hypertools
Up to 4 HD camera can be displayed on one monitor at the same time
■ Divider of Sanwa Supply
Images of four high definition cameras can be displayed on one monitor at the same time.
If there are many more screens, it seems that many inputs are of BNC type.
The following will be the input HDMI (Hi-vision) 16 divider.