| 摘要 |
PROBLEM TO BE SOLVED: To reduce the burden for work and operation when switching and displaying pictures fed from a lot of computers on an electronic white board. SOLUTION: An electronic white board system is provided with an operation means for operation to select one of a lot of computers 3 and 4 and a switching means 1 which supplies a picture signal from the computer selected by the operation means to a picture projection means 5 for picture projection on an electronic white board 2 and is used for transmission and reception of a control signal, which should be transmitted and received between the electronic white board 2 and computers, between the electronic white board 2 and the computer selected by the operation means.
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