There is provided a contents processing device of a contents processing system having a plurality of contents input units including network input units, a plurality of contents output units that is related to a plurality of zones and outputs the contents to the plurality of zones, respectively, an NET selector for outputting the contents input into the network input units to a specific contents output unit of the plurality of contents output units, and an NET selector controller for, when a receiving unit receives the contents reproduction notification, controlling an operation of the NET selector according to a predetermined NET selector procedure so that a user's estimated reproduction requirement is satisfied.