The present invention is directed to provide an AV processing device and the like that allow mixing three or more AV signals through easy operation. According to the invention, an AV processing device 30 includes an input unit 310 inputting three or more AV signals that are audio signals or video signals, a coordinate point assigning unit 322 assigning a given coordinate point in a predetermined two-dimensional region in which a coordinate axis for each input AV signal indicating its mixing rate from minimum to maximum is virtually assigned, a mixing rate calculator 331 calculating the mixing rate of each AV signal based on the coordinate axis for the AV signal and the assigned coordinate point, a mixed AV signal generator 332 generating mixed AV signals based on the calculated mixing rate of each AV signal, and an output unit 350 outputting the generated mixed AV signals.
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