1. A method for obtaining a voice service, comprising: obtaining information on a service process corresponding to a service number of a call, wherein the information on the service process comprises input prompt information for each stage of the service process, and the input prompt information is used to prompt a user for input; displaying, after getting through the call, the input prompt information of the service process; receiving an input signal from the user in response to the input prompt information; and sending the input signal to an automatic voice service system to obtain a service therefrom; wherein displaying, after getting through the call, the input prompt information of the service process and receiving the input signal from the user in response to the input prompt information comprises: when the service process comprises n stages, displaying input prompt information of an i th stage of the service process, wherein n and i are positive integers and i is of an initial value of 1; receiving an input signal from the user in response to the input prompt information of the i th stage; when i<n and the service process has input prompt information of an (i+1) th stage corresponding to the input prompt information of the i th stage upon triggering of the input signal, determining input prompt information of the (i+1) th stage triggered by the input signal according to the service process and the input prompt information of the i th stage; and adding i by 1, and re-performing the step of displaying the input prompt information of the i th stage of the service process.