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In a map data update method for updating map data used in an on-vehicle navigation apparatus by installing update map data, an authentication key is generated based upon an apparatus-inherent ID assigned in correspondence to the navigation apparatus and the use of update map data installed in the na

In a map data update method for updating map data used in an on-vehicle navigation apparatus by installing update map data, an authentication key is generated based upon an apparatus-inherent ID assigned in correspondence to the navigation apparatus and the use of update map data installed in the navigation apparatus is enabled or disabled by verifying the authentication key assigned to the navigation apparatus.

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What is claimed is: 1. A navigation apparatus for use in a map data update system including an authentication key generation apparatus, comprising: an obtaining unit that obtains the authentication key generated by the authentication key generation apparatus based upon an apparatus-inherent ID assi

What is claimed is: 1. A navigation apparatus for use in a map data update system including an authentication key generation apparatus, comprising: an obtaining unit that obtains the authentication key generated by the authentication key generation apparatus based upon an apparatus-inherent ID assigned each of the navigation apparatus, a version of an update map data and a specified map area; a calculation unit that calculates a reference key to be referenced against the authentication key based upon information indicating the apparatus ID, which is held at the navigation apparatus, and update map data version information and map area information recorded in the update map data that has been installed in the navigation apparatus; a decision-making unit that makes a decision as to whether or not the authentication key is correct by comparing the authentication key having been obtained with the reference key; and an enabling/disabling unit that enables the use of the update map data over the specified map area if the authentication key is judged to be correct or disables the use of the update map data if the authentication key is judged to be incorrect. 2. A computer-implemented map data update method for updating map data used in an on-vehicle navigation apparatus by installing an update map data, comprising: generating an authentication key based upon an apparatus-inherent ID assigned each of the navigation apparatus and a version of the update map data; and enabling or disabling a use of the update map data installed in the navigation apparatus by verifying the authentication key assigned to the navigation apparatus, wherein: the authentication key is generated in response to a request issued from a user and entered in the navigation apparatus by the user; and the navigation apparatus enables the use of the update map data during a predetermined period of time regardless of whether or not the authentication key is entered by the user and disables the use of the update map data unless the authentication key is entered after the predetermined period of time expires. 3. A computer-implemented map data update method for updating map data used in an on-vehicle navigation apparatus by installing an update map data, comprising: generating an authentication key based upon an apparatus-inherent ID assigned each of the navigation apparatus, a version of the update map data and a specified map area; and enabling or disabling a use of the update map data installed in the navigation apparatus by verifying the authentication key assigned to the navigation apparatus, wherein: the navigation apparatus obtains the authentication key generated outside based upon the apparatus ID, the version of the update map data and the specified map area; the navigation apparatus calculates a reference key to be referenced against the authentication key based upon information indicating the apparatus ID, which is held at the navigation apparatus, and update map data version information and map area information recorded in the update map data; the navigation apparatus makes a decision as to whether or not the authentication key is correct by comparing the authentication key having been obtained with the reference key; and the navigation apparatus enables the use of the update map data over the specified map area if the authentication key is judged to be correct or disables the use of the update map data if the authentication key is judged to be incorrect. 4. A computer-implemented map data update method according to claim 2, wherein: the authentication key is generated based upon the apparatus ID, the version of the update map data and a user-inherent ID assigned to each user in advance. 5. A computer-implemented map data update method according to claim 3, wherein: the authentication key is generated based upon the apparatus ID, the version of the update map data, the specified map area and a user-inherent ID assigned to each user in advance.