1. A method for increasing acquisition efficiency in a code division multiple access (CDMA) communication system, the method comprising the following steps: receiving a first signal; generating a second signal by executing a Fourier transform operation on the first signal; determining a plurality of shift signals generated each time the second signal being shifted by a first frequency; selecting a pseudo-random code from a plurality of pseudo-random codes, and obtaining a Fourier transform result of the pseudo-random code; multiplying the Fourier transform result of the pseudo-random code with the plurality of shift signals, and executing an inverse Fourier transform operation on the multiplication result to generate an inverse Fourier transform result; and determining an acquisition status according to the inverse Fourier transform result.