At present, most of terminal devices on the market are equipped with a voice function, so as to facilitate a user directly entering an anticipated interface by using the voice function, which is operationally convenient. Meanwhile, to better facilitate a user understanding a change in a volume value of a voice input by the user, a voice assistant in an existing terminal device that is equipped with a voice function can generally display, in the form of an image, a volume value of a voice input by a user. In the prior art, a pattern of concentric circles with different radiuses is generally used to indicate a change in the size of a volume value. Specifically, the voice assistant acquires in real time a voice input by a user, and adjusts, according to the size of a volume value of the acquired input voice, the radius of a concentric circle. In this display mode, a change in a volume value of a user's voice may be visually reflected in real time. If the volume value is greater, the radius of a concentric circle is greater and the corresponding concentric circle is larger.
However, when there is a great change between two adjacent volume values of a voice input by a user, that is, a volume value of a voice input by a user is abruptly changed, the size of a concentric circle correspondingly displayed on a display screen of the terminal device is changed sharply, which causes a displayed pattern of a volume value to change surprisingly, leading to poor user experience.