1. A pattern code recognition multimedia playback-system, comprising: a pattern code-printed material on which a pattern code is printed; a pattern code recognition pen for recognizing the pattern code printed on the pattern code-printed material; and a pattern code recognition set-top box for: receiving the pattern code from the pattern code recognition pen, extracting multimedia data corresponding to the pattern code received from the pattern code recognition pen, and outputting the multimedia data to a display unit; wherein the pattern code recognition set-top box switches an operation mode of the pattern code recognition set-top box to a lock mode when the pattern code recognition set-top box does not receive another pattern code for a predetermined time after receiving the pattern code; wherein the lock mode defines a state in which the pattern code recognition set-top box does not perform a process corresponding to a signal received from the pattern code recognition pen, but continues outputting the multimedia data to the display unit such that in the lock mode the multimedia data continues to be displayed by the display unit; and wherein the pattern code recognition set-top top box deactivates the lock mode when a receiver of the pattern code recognition set-top box receives a second pattern code including a predetermined lock release command from the pattern code recognition pen.