1. A spoken dialogue interface apparatus, comprising: a speech recognition module for recognizing a human's speech from a sound signal; a user intention interpretation module for extracting a sentence from the recognized speech and interpreting a user's intention based on the sentence; a user intention selection module for determining user intention using the interpreted user's intention and a predetermined domain action frame; and a system response generation module for generating a system response sentence corresponding to the selected user intention; wherein the domain action frame includes service information which the user requests, and parameter information which is used to perform a service, and the domain action frame is constructed to have a hierarchical tree structure.