Disclosed is an integrated circuit in which more than two kinds of information outputs are superimposed on the same output terminal and the output level of an output terminal is varied in more than three steps in order to apply many information outputs to a small number of output terminals and transmit the operation state of the internal circuit externally. The structure of the integrated circuit is simplified, because the number of terminals in the integrated circuit and the number of connection wires between internal and external circuits can be reduced.