The present invention provides an information processing apparatus that estimates a line of sight of a person, executing a first calculation of estimating a direction of a face of the person using a first model that outputs a calculation result of the direction of the face of the person when an image of the face of the person is input; and executing a second calculation of estimating the line of sight of the person using a second model that outputs a calculation result of the line of sight of the person when an image of at least one eye of the person is input, wherein the at least one processor is configured to change coefficients of the second model to be used in the second calculation, according to the direction of the face estimated in the first calculation.