According to one embodiment, an interface apparatus for displaying a GUI object according to a position and a direction of a pointing object comprises a display unit, an image capturing unit, a detection unit, and an additional display unit. The display unit displays a movie based on a first image frame group. The image capturing unit obtains a second image frame group by capturing an image of a surface on which the movie is displayed. The detection unit detects a position and a direction of the pointing object based on the first image frame group and the second image frame group. The additional display unit displays a specific shape which is superimposed to the first image frame group, so that the detected position of the pointing object is irradiated with light of no less than a predetermined illuminance and the light attenuates according to a distance from the position.