To unnecessitate the arrangement of a converting circuit in connection with a pre-existed electronic circuit and to simplify circuit configuration by using an integrating circuit which is cascade-connected to a chaotic neuron circuit.

The chaotic neuron circuit is provided with a pre-processing circuit part and a post-processing circuit part capable of dealing with digital data. The post-processing circuit part provided at the output stage of the circuit is constituted of a central processing unit(CPU) 21, RAM 22, an interface circuit 23, a counter 24, an adder(ALU 1) 25, a pipeline register(PR) 26, the adder(ALU 2) and the integrating circuit 28. In the integrating circuit 28, a reciprocal is obtained from a counter value which is outputted from the counter 24, the reciprocal and an output xk from ALU 2 are inputted and their integrated value is inputted to one input terminal of ALU 2. The cascade-connected integrating circuit 28 is used so that the input/output of a digital chaos signal is easily attained.