An in-vehicle navigation apparatus includes the following: a master road regulation data table which stores a master road regulation data to be associated with road segments as applied targets; a temporary road regulation data table, which is prepared apart from the master road regulation table and stores temporary road regulation data to be associated with road segments and applied in preference to the master road regulation data; and a data determination unit which determines with respect to each road segment an application of either the master road regulation data or temporary road regulation data based on reference information for determining road regulation data validity. The determined road regulation data is outputted.