Apparatus for and method of generating difference update data for navigation, navigation apparatus and method, difference update data set for navigation, and computer program product

摘要

An apparatus generates difference update data for navigation with respect to a plurality of road data for the navigation. Each of the plurality of road data indicates at least one of an existing road and a junction thereof in a preset road network. The difference update data includes one road data for the navigation. The one road data indicates at least one of a new road and a junction thereof and is updated versus the plurality of road data as a standard. The apparatus is provided with: a first generating device for generating the difference update data such that the difference update data includes, in addition to the one road data, same road data which is same as another road data indicating at least one of the existing road and the junction thereof that are connected to the new road or the junction thereof among the plurality of road data; and a second generating device for generating merge data defining a relationship between the difference update data and the plurality of road data, such that the merge data includes a delete flag to delete said another road data from the plurality of road data on a predetermined process for the navigation.