Visual field calculation apparatus and method for calculating visual field

A visual field calculation apparatus comprising:

• a saccade detector that obtains gaze direction information including gaze directions of a user in a saccade detection period, and detects a first plurality of saccades on a basis of a moving amount of each of the gaze directions in unit time;
• a saccade speed calculator that calculates a speed of each of the plurality of first saccades in the unit time;
• and
• a visual field range calculator that extracts a second plurality of saccades whose speeds exceed a first threshold from among the first plurality of saccades, calculates displacement vectors of the second plurality of saccades, and calculates an area including an initial point and a final point of each of the displacement vectors as the visual field range of the user,
• wherein the first threshold is a value which separates exogenous saccades and endogenous saccades, and
• the visual field range of the user is calculated in a range of a surface, and information is displayed on the surface relative to the visual field range.