To provide a blind equalizing technology taking advantage of CMA and MMA by using constant modulus algorithm(CMA) and multi-modulus algorithm(MMA) at blind start up.

At blind start up, CMA and MMA are used. This approach provides a base for shift algorithm. One example of shift algorithm is CMA- MMA shift algorithm. One example of shift algorithm is CMA-MMA shift algorithm and an adaptive filter is simply switched from CMA to MMA. The digital CMA processing processor 400 of the receiver contatins a central arithmetic processing unit (processor) 405 and a memory 410, for example. When a part of the memory 410 is executed by the processor 405, it is used for storing a program instruction for crystallizing connection CMA-MMA type algorithm.