1. A terminal apparatus including position detection means and display means, wherein the terminal apparatus comprises: geographic information storage means for storing three-dimensional terrain shape information; attitude detection means for detecting an attitude of the terminal apparatus; and image creation means for obtaining information on a vector vertical to the display means based on information on the attitude obtained by the attitude detection means and creating a three-dimensional terrain image on a line-of-sight using a current position obtained by the position detection means, information on the line-of-sight defined by the information on the vector, and the three-dimensional terrain shape information in the geographic information storage means; and when the attitude of the terminal apparatus is changed, the three-dimensional terrain image on the display means is updated, following the change in the attitude of the terminal apparatus.