PURPOSE: To provide a complex signal transformation circuit capable of simultaneously transforming the elements of the space vector of input signals by providing plural resistors provided with a prescribed connection structure between both plural first conductors and plural second conductors.

CONSTITUTION: A resistor network 10 is provided with 'N' number of input terminals, voltages V12, V14, V16 to VN are respectively applied to the inputs 12, 14, 16 and 'N' of the resistor network 10 and the voltage V18 is expanded to an output 18 corresponding to it. The network 10 is constituted by using the resistor R12' connected between the input 12 and the output 18, the resistor R14' connected between the input 14 and the output 18 and the resistor R16' connected between the input 16 and the output 18. Thus, the complex transformation of the space vector such as Fourier, Laplace and convolution integration is simultaneously achieved and data throughput is improved.