Patent ID: 7885716

Claim:
An audio/visual data communication system comprising: an audio/visual data transmitting device that transmits data through a power line; and an audio/visual data reproducing device that receives the data and reproduces the data, wherein the audio/visual data reproducing device includes: an instruction input unit that inputs an instruction to change the data received from the audio/visual data transmitting device; a message generating unit that generates a message for requesting to change the data transmitted from the audio/visual data transmitted device on the basis of the instruction input through the instruction input unit; and a message transmitting unit that transmits the message generated by the message generating unit to the audio/visual data transmitting device, and the audio/visual data transmitting device includes: a message receiving unit that receives the message transmitted from the message transmitting unit; a data setting unit that sets data to be transmitted to the audio/visual data reproducing device on the basis of the message received by the message receiving unit; a data generating unit that generates transmission data to be transmitted to the audio/visual data reproducing device on the basis of the data set by the data setting unit; and a data transmitting unit that transmits the transmission data generated by the data generating unit to the audio/visual data reproducing device.