1. A method for extracting a prosodic feature of a speech signal, comprising: dividing the speech signal into speech frames; transforming the speech frames from time domain to frequency domain; and calculating respective prosodic features for different frequency ranges, wherein calculating the respective prosodic features for different frequency ranges comprises one or more of the following processing: calculating a thickness feature of the speech signal for a first frequency range, wherein the thickness feature is based on frequency domain energy of the first frequency range; calculating a strength feature of the speech signal for a second frequency range, wherein the strength feature is based on time domain energy of the second frequency range; and calculating a contour feature of the speech signal for a third frequency range, wherein the contour feature is based on time domain envelope of the third frequency range.