A contents processing device having a network service function for reproducing contents on a network comprising: a plurality of contents input units (62, 64, 66, 70, 72) including network input units, wherein the network input units are connected to the network; a plurality of contents output units (74, 76, 78) that is related to a plurality of zones (12, 14, 16) and is adapted to output the contents to contents reproducing devices disposed in the plurality of zones (12, 14, 16), respectively; a NET selector for outputting the contents input into the network input units to a specific contents output unit (74, 76, 78) of the plurality of contents output units (74, 76, 78); a receiving unit that is provided between the network input units and the NET selector and is adapted to receive transmission of a contents reproduction notification to the network input units, wherein the contents reproduction notification includes controller information or processing information about contents to be reproduced; and a NET selector controller that is adapted to communicate with the receiving unit and when the receiving unit receives the contents reproduction notification, is adapted to control an operation of the NET selector according to a predetermined NET selector procedure so that a user's estimated reproduction requirement is satisfied, wherein the predetermined NET selector procedure includes a zone-on determining procedure that is adapted to determine whether a zone output function for outputting the contents is ON in the plurality of zones (12, 14, 16), respectively, in the plurality of contents output units (74, 76, 78), a NET selector determining procedure that is adapted to, when the determination is made that the output function in any of the plurality of zones (12, 14, 16) is ON, determine whether the NET selector control for outputting the contents from the network input units to the contents output unit (74, 76, 78) corresponding to the ON-zone is already made, and a network service changing procedure that is adapted to, when the determination is made that the NET selector control is made on the ON-zone in the NET selector determining procedure, change the contents to be output to the contents output unit (74, 76, 78) corresponding to the ON-zone into contents input into the network input units. a plurality of contents input units (62, 64, 66, 70, 72) including network input units, wherein the network input units are connected to the network; a plurality of contents output units (74, 76, 78) that is related to a plurality of zones (12, 14, 16) and is adapted to output the contents to contents reproducing devices disposed in the plurality of zones (12, 14, 16), respectively; a NET selector for outputting the contents input into the network input units to a specific contents output unit (74, 76, 78) of the plurality of contents output units (74, 76, 78); a receiving unit that is provided between the network input units and the NET selector and is adapted to receive transmission of a contents reproduction notification to the network input units, wherein the contents reproduction notification includes controller information or processing information about contents to be reproduced; and a NET selector controller that is adapted to communicate with the receiving unit and when the receiving unit receives the contents reproduction notification, is adapted to control an operation of the NET selector according to a predetermined NET selector procedure so that a user's estimated reproduction requirement is satisfied, a zone-on determining procedure that is adapted to determine whether a zone output function for outputting the contents is ON in the plurality of zones (12, 14, 16), respectively, in the plurality of contents output units (74, 76, 78), a NET selector determining procedure that is adapted to, when the determination is made that the output function in any of the plurality of zones (12, 14, 16) is ON, determine whether the NET selector control for outputting the contents from the network input units to the contents output unit (74, 76, 78) corresponding to the ON-zone is already made, and a network service changing procedure that is adapted to, when the determination is made that the NET selector control is made on the ON-zone in the NET selector determining procedure, change the contents to be output to the contents output unit (74, 76, 78) corresponding to the ON-zone into contents input into the network input units.