Patent ID: 7080003

Claim:
An interactive speech interface unit comprising: a speech recognizer that recognizes input speech of user utterance and converts the recognized input speech into a character string; an input statement analyzer that analyzes the character string and converts the analyzed character string into semantic representation; an interactive controller that controls flow of an interactive status and accessing an application, the interactive controller putting series of interactive sequences having calling relations together in a plurality of interactive tasks having an upper interactive task and a lower interactive task in a hierarchical structure, the interactive controller modifying one of the interactive sequences in an upper interactive task in accordance with a lower interactive task; an output statement generator that generates an intermediate language to be output to the user; a speech generator that converts the intermediate language into speech and outputs the speech; an application interface that accesses an application using the semantic representation output from the interactive controller; and an interactive task hierarchical database that stores the interactive tasks including the modified interactive sequence in a hierarchical structure.