1. A navigation apparatus comprising: a display part having a display screen; character data storing means for storing character data including plural types of fonts with respect to each character in order to display characters on a road map in the display screen; and display control means for obtaining road map data and displaying, on the basis of the obtained road map data, a road map in the display screen, wherein the display control means reads character data of a font type corresponding to a category of an object to be indicated by the characters displayed on the road map out of the character data storing means and displays the character data on the road map.