Both a telephone number dictionary and a number dictionary are used for speech recognition of telephone numbers. The telephone number dictionary stores actually existent telephone numbers for fixed-line phones. The number dictionary stores variable numbers and digits. The telephone number dictionary ensures a relatively high recognition rate. When only the telephone number dictionary is used, the speech recognition dictionary needs to be updated each time a toll number or a local office number is changed. When it is necessary to recognize a mobile phone number that is frequently added or changed, the speech recognition dictionary also needs to be updated frequently. Such update work is very bothersome. However, the number dictionary can be used for speech recognition. The update work becomes unnecessary.