INTERACTIVE DEVICE

PURPOSE:To detect a part which a system cannot analyze in a user input sentence at an early time point, and to attain smooth interaction by analyzing a character string in the middle of an input even when the input of a sentence is not completed, and responding at such a time point. CONSTITUTION:An input part 1 to input a natural language sentence by a user, an analyzing part 2 to determine the meaning of the input character string for the character string obtained from the input part 1, a problem solving part 3 to solve a problem based on an analysis result and to determine a response to the user, and a responding part 4 to output responding contents are provided. Consequently, before an input completion mark is inputted by the user, the already inputted character string can be analyzed. Thus, the part which an interactive device cannot analyze can be recognized at the early time point, and a processing according to the part can be executed.