8. A data updating method for a terminal coupled to a server via a network, the terminal including a speech recognition system and holding map data including a landmark, the speech recognition system managing recognition data including a word corresponding to a name of the landmark included in the held map data, the data update method comprising the steps of: sending, by the terminal, update area information indicating an area of the map data to be updated, and update data on the area to be updated to the server; generating, by the server, in a case of which recognition data of the area indicated by the update area information sent from the terminal has been changed, after a time point indicated by the update data sent from the terminal, difference data between latest recognition data and recognition data corresponding to the area indicated by the update area information at a time indicated by the update data; sending, by the server, the generated difference data to the terminal along with map data on the area indicated by the update area information; updating, by the terminal, the map data held in the terminal based on the map data sent from the server; and updating, by the terminal, the managed recognition data based on the difference data sent from the server; wherein: the recognition data includes confusion information, the confusion information including a confusion word having a tendency to cause a recognition error with the word corresponding to a name of the landmark, and a confusion score which represents the tendency of the confusion word to cause recognition error; the server sends the difference data including the confusion information to the terminal; and the method further comprises the step of updating, by the terminal, the confusion information included in the recognition data held by the terminal based on the confusion information sent from the server.
8. A data updating method for a terminal coupled to a server via a network, the terminal including a speech recognition system and holding map data including a landmark, the speech recognition system managing recognition data including a word corresponding to a name of the landmark included in the held map data, the data update method comprising the steps of: sending, by the terminal, update area information indicating an area of the map data to be updated, and update data on the area to be updated to the server; generating, by the server, in a case of which recognition data of the area indicated by the update area information sent from the terminal has been changed, after a time point indicated by the update data sent from the terminal, difference data between latest recognition data and recognition data corresponding to the area indicated by the update area information at a time indicated by the update data; sending, by the server, the generated difference data to the terminal along with map data on the area indicated by the update area information; updating, by the terminal, the map data held in the terminal based on the map data sent from the server; and updating, by the terminal, the managed recognition data based on the difference data sent from the server; wherein: the recognition data includes confusion information, the confusion information including a confusion word having a tendency to cause a recognition error with the word corresponding to a name of the landmark, and a confusion score which represents the tendency of the confusion word to cause recognition error; the server sends the difference data including the confusion information to the terminal; and the method further comprises the step of updating, by the terminal, the confusion information included in the recognition data held by the terminal based on the confusion information sent from the server. 13. The data updating method according to claim 8 , further comprising the steps of: extracting, by the server, confusion information on a word having a tendency to cause a recognition error with a word included in the difference data, and sending the extracted confusion information as confusion subject information to the terminal; and updating, by the terminal, the managed confusion information based on the confusion subject information sent from the server.