Spoken dialog system capable of performing natural interactive access

A spoken dialog system comprising:

• an input storing unit for storing therein an input voice in combination with time information;
• a dictionary storing unit for classifying a key word to be recognized every item so as to define the classified key word;
• a dictionary selecting unit for selecting a key word corresponding to designated dictionary selection information from said dictionary storing unit to thereby output the selected key word as a recognized dictionary;
• a voice recognizing unit for recognizing an input voice or the input voice in said input storing unit with respect to a designated recognition section with employment of the recognized dictionary selected from said dictionary selecting unit, and for outputting the extracted key word candidate in combination with the recognition section;
• a confirmed history storing unit for storing therein a history of a determined key word every speech;
• and
• a dialog managing unit for causing a user to confirm the key word candidate outputted from said voice recognizing unit;
• for registering the confirmed key word candidate as a determined key word into said confirmed history storing unit;
• for judging as to whether or not an input voice other than the determined key word is recognized based upon both a section of the determined key word and a recognition section thereof;
• and for executing such operations that when the judgment result is the recognition to be once again, both an item and the determined key word are transferred as dictionary selection information to said dictionary selecting unit;
• a section of an input voice other than the determined key word is updated as a re-recognition section;
• and also the updated confirmation section is instructed to said voice recognizing unit, whereas when the judgment result is not the recognition to be once again performed, a predetermined interactive operation is carried out in response to the determined key word.