An animation character drive method, performed by an audio and video processing device, the method comprising: obtaining (S201) media data comprising a facial expression and a corresponding speech of a speaker; determining (S202) a first expression base of a first animation character corresponding to the speaker according to the facial expression, the first expression base identifying expressions of the first animation character; determining (S203), according to target text information, the media data, and the first expression base, an acoustic feature and a target expression parameter corresponding to the target text information, the acoustic feature identifying a sound simulating the speaker saying the target text information, and the target expression parameter identifying a change degree of a facial expression simulating the speaker saying the target text information relative to the first expression base; and driving (S204) a second animation character having a second expression base according to the acoustic feature and the target expression parameter, characterized in that : wherein the first animation character and the second animation character are different animation characters, the first expression base is different from the second expression base, and the driving (S204) a second animation character having a second expression base according to the acoustic feature and the target expression parameter comprises: determining a mapping relationship between an expression parameter corresponding to the first expression base and an expression parameter corresponding to the second expression base; and driving the second animation character according to the acoustic feature, the target expression parameter, and the mapping relationship. obtaining (S201) media data comprising a facial expression and a corresponding speech of a speaker; determining (S202) a first expression base of a first animation character corresponding to the speaker according to the facial expression, the first expression base identifying expressions of the first animation character; determining (S203), according to target text information, the media data, and the first expression base, an acoustic feature and a target expression parameter corresponding to the target text information, the acoustic feature identifying a sound simulating the speaker saying the target text information, and the target expression parameter identifying a change degree of a facial expression simulating the speaker saying the target text information relative to the first expression base; and driving (S204) a second animation character having a second expression base according to the acoustic feature and the target expression parameter, characterized in that : wherein the first animation character and the second animation character are different animation characters, the first expression base is different from the second expression base, and the driving (S204) a second animation character having a second expression base according to the acoustic feature and the target expression parameter comprises: determining a mapping relationship between an expression parameter corresponding to the first expression base and an expression parameter corresponding to the second expression base; and driving the second animation character according to the acoustic feature, the target expression parameter, and the mapping relationship. determining a mapping relationship between an expression parameter corresponding to the first expression base and an expression parameter corresponding to the second expression base; and driving the second animation character according to the acoustic feature, the target expression parameter, and the mapping relationship. <EOS>