A method of optimizing a sound signal, the method being used in a terminal device including at least two sound collecting units, the method comprising: determining positions (102, 202) of sound sources around the terminal device via the at least two sound collecting units; selecting, according to an intensity and a continuity of sound signals corresponding to the positions of the sound sources, a designated sound source among the respective sound sources determined by determining the positions of the sound sources; determining (106, 206) a sound signal emitted from the designated sound source among the sound signals collected by the terminal device according to a spatial position of the designated sound source acquired by determining the positions of the sound sources; and optimizing a volume of the sound signal emitted from the designated sound source, wherein the step of determining positions (102, 202) of sound sources around the terminal device via the at least two sound collecting units comprises: acquiring a time difference and a phase difference of each sound signal emitted by the sound sources arriving at the at least two sound collecting units; and determining the spatial position of the sound source with respect to the terminal device according to the time difference and the phase difference of the sound signal emitted by the sound source arriving at the at least two sound collecting units, characterized in that: the step of selecting a designated sound source among respective sound sources comprises: setting a weighting for each sound signal according to the intensity of the sound signal, wherein the weighting according to the intensity of the sound signal is set such that: the nearer the intensity is to a pre-set normal sound intensity of people talking, the higher the weighting, and the greater the difference between the intensity and the pre-set normal sound intensity of people talking, the lower the weighting; and setting a weighting for each sound signal according to the time duration of the sound signal; ranking the respective sound sources according to their corresponding weightings; and selecting the designated sound source as the sound source having the highest ranking. determining positions (102, 202) of sound sources around the terminal device via the at least two sound collecting units; selecting, according to an intensity and a continuity of sound signals corresponding to the positions of the sound sources, a designated sound source among the respective sound sources determined by determining the positions of the sound sources; determining (106, 206) a sound signal emitted from the designated sound source among the sound signals collected by the terminal device according to a spatial position of the designated sound source acquired by determining the positions of the sound sources; and optimizing a volume of the sound signal emitted from the designated sound source, wherein the step of determining positions (102, 202) of sound sources around the terminal device via the at least two sound collecting units comprises: acquiring a time difference and a phase difference of each sound signal emitted by the sound sources arriving at the at least two sound collecting units; and determining the spatial position of the sound source with respect to the terminal device according to the time difference and the phase difference of the sound signal emitted by the sound source arriving at the at least two sound collecting units, acquiring a time difference and a phase difference of each sound signal emitted by the sound sources arriving at the at least two sound collecting units; and determining the spatial position of the sound source with respect to the terminal device according to the time difference and the phase difference of the sound signal emitted by the sound source arriving at the at least two sound collecting units, characterized in that: the step of selecting a designated sound source among respective sound sources comprises: setting a weighting for each sound signal according to the intensity of the sound signal, wherein the weighting according to the intensity of the sound signal is set such that: the nearer the intensity is to a pre-set normal sound intensity of people talking, the higher the weighting, and the greater the difference between the intensity and the pre-set normal sound intensity of people talking, the lower the weighting; and setting a weighting for each sound signal according to the time duration of the sound signal; ranking the respective sound sources according to their corresponding weightings; and selecting the designated sound source as the sound source having the highest ranking. setting a weighting for each sound signal according to the intensity of the sound signal, wherein the weighting according to the intensity of the sound signal is set such that: the nearer the intensity is to a pre-set normal sound intensity of people talking, the higher the weighting, and the greater the difference between the intensity and the pre-set normal sound intensity of people talking, the lower the weighting; and the nearer the intensity is to a pre-set normal sound intensity of people talking, the higher the weighting, and the greater the difference between the intensity and the pre-set normal sound intensity of people talking, the lower the weighting; and setting a weighting for each sound signal according to the time duration of the sound signal; ranking the respective sound sources according to their corresponding weightings; and selecting the designated sound source as the sound source having the highest ranking.