To shift the phase of a PN code string of a long period by a compact and simple phase shifting device.

The phase shifting method of the PN code string for shifting the phase of the PN code string of a period (2N-1) [chip] by the M system of N (N is a positive integer) bits according to phase shifting information consisting of L (L is a positive integer) +N bit data extracts high-order L-bit data and low-order N-bit data respectively from phase shift information to shift the phase of the PN code string by a X=2N×Y+Z [chip] being the total of a phase shift quantity 2N×Y (Y is 0 or a positive integer) [chip] equivalent to the L-bit data and a phase shift quantity Z (Z is an integer 0≤Z<2N) [chip] equivalent to the N-bit data.