Speech recognition apparatus and method thereof

A voice recognition unit includes a recognition dictionary storing section 105 having hierarchical structure, a control section 107 that extracts a desired dictionary out of the speech recognition dictionaries as a list of queuing words, a recognition dictionary selecting section 104 that selects a desired dictionary, a RAM 103 that stores the dictionary selected by the selecting means as a list of queuing words at the uppermost hierarchy together with the normal dictionary extracted by the control section 107 and a recognizing section 102 that recognizes input voice by comparing the input voice and the list of queuing words stored in the RAM 103.