To enable an audience to taste a feeling of participating in a program by discriminating and reading out specific information transmitted from the TV side and recognizing and displaying the order of the input of the contents and the input by one or plural push button switches attached to the TV set.

The signal when an answerer in a TV program pushes a switch is converted into a sound or light and is preliminarily registered. When an audience looks into a TV program and a problem is submitted, the audience pushes a push button switch at the time point of solving the problem and the signal is compared with the signal when the answerer in the TV program pushes the button switch and the result of the comparison is displayed. The signal of pushing the switch in the TV side is made to change the color of a small site on the corner of the screen when the answerer pushes the button switch and it is made into inputting through optical fiber or the sound when the switch is pushed is read out and inputted.