Keyword generation apparatus and keyword generation method

A keyword generation apparatus for use with a vehicle navigation system, comprising:

• a vocabulary acquisition unit that acquires a keyword uttered by a first user;
• a first information acquisition unit that acquires first information including (1) information representing a first location at which the first user has uttered the keyword and (2) information related to at least one of the first user's movement direction or destination;
• a storage unit that stores the first information and the keyword in association with each other;
• a second information acquisition unit that acquires second information from the vehicle navigation system, the second information including (1) information representing a current position of a second user and (2) information related to at least one of the second user's movement direction or destination;
• and
• an extraction unit that extracts a keyword unique to a locality in which the second user is positioned and corresponding to the second user's movement direction or destination from the storage unit based on the second information.