An integrated communication and capacitive sensing circuit and an interactive system using the same are provided in the present invention. The integrated communication and capacitive sensing circuit includes a microprocessor, a sensing electrode and a resonant circuit. The microprocessor includes a first input/output (I/O) pin and a second I/O pin. The sensing electrode is coupled to the first I/O pin of the microprocessor. The input terminal of the resonant circuit is coupled to the second I/O pin of the microprocessor, and the output terminal of the resonant circuit is coupled to the sensing electrode. When sensing the capacitance is performed, the first I/O pin of the microprocessor detects the charging/discharging state of the sensing electrode to determine the capacitive variation. When a data output is performed, the first I/O pin of the microprocessor is set to high impedance, and the second I/O pin of the microprocessor outputs or does not output a high frequency carrier according to a transmission data, wherein the resonant circuit amplifies the amplitude of the high frequency carrier.