| 摘要 |
A PC is authenticated by a server (SEQ 100 ). When a monitoring start request is issued (SEQ 101 ), an in-house security unit generates a one-time key (SEQ 106 ). The one-time key and information ex. a port number with which the PC is connected to the in-house security unit is passed to the PC through the server (SEQ 110 ). The PC and the in-house security unit are connected in PtoP (SEQ 111 ). The in-house security unit encrypts a picture photographed by the surveillance camera with the one-time key and then streamingly transmits the encrypted picture data to the PC (SEQ 114 ). The PC decrypts the received stream data with the pre-received one-time key, restores the original picture, and displays the restored original picture on a display portion. When a monitoring stop request is sent from the PC to the in-house security unit (SEQ 112, 123 ), the in-house security unit deletes the one-time key (SEQ 124 ).
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