| 摘要 |
PROBLEM TO BE SOLVED: To automatically switch between a single image display and quadripartite display by using a quadripartite switcher. SOLUTION: At the time of receiving image data only by one line control part according to reception information from a security data processing part 46, a control part 45 instructs the selection of image data which are being received by the line controlling part to a quadripartite switcher 47. Also, at the time of receiving the image data by plural line control parts according to the reception information from the security data processing part 46, the control part 45 instructs the selection of synthetic image data to the quadripartite switcher 47.
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