An information display apparatus which displays, on a screen, notification information to be presented to a user, said information display apparatus comprising: a user state detecting unit configured to detect, as a user state, positions of gazing points within a predetermined time period, said gazing points being found on a plane including the screen; and a degree-of-concentration estimating unit configured to estimate a degree of concentration based on a distribution of said gazing points detected, as the user state, by said user state detecting unit within said predetermined time period, the degree of concentration indicating a degree in which the user concentrates on the screen; a user information database which holds the degree of concentration in association with an effective visual field area information indicating a distance from the center position of the distribution of said gazing points, said effective visual field area being visible to the user, an application control unit configured to (i) obtain an effective visual field area information associated with the degree of concentration estimated by said degree-of-concentration estimating unit with reference to said user information database, and (ii) determine, as an initial display position of the notification information based on the degree of concentration estimated by said degree-of-concentration estimating unit, a position which is a given length of distance away from the center position of the distribution of said gazing points, such that the initial display position is located outside the estimated effective visual field area; and a rendering unit configured to (i) display the notification information at the initial display position determined by said application control unit, and (ii) change at least one of a display position and a display state of the displayed notification information. a user state detecting unit configured to detect, as a user state, positions of gazing points within a predetermined time period, said gazing points being found on a plane including the screen; and a degree-of-concentration estimating unit configured to estimate a degree of concentration based on a distribution of said gazing points detected, as the user state, by said user state detecting unit within said predetermined time period, the degree of concentration indicating a degree in which the user concentrates on the screen; a user information database which holds the degree of concentration in association with an effective visual field area information indicating a distance from the center position of the distribution of said gazing points, said effective visual field area being visible to the user, an application control unit configured to (i) obtain an effective visual field area information associated with the degree of concentration estimated by said degree-of-concentration estimating unit with reference to said user information database, and (ii) determine, as an initial display position of the notification information based on the degree of concentration estimated by said degree-of-concentration estimating unit, a position which is a given length of distance away from the center position of the distribution of said gazing points, such that the initial display position is located outside the estimated effective visual field area; and a rendering unit configured to (i) display the notification information at the initial display position determined by said application control unit, and (ii) change at least one of a display position and a display state of the displayed notification information.