A head mounted image-sensing display device comprising: a pair of image-sensing means (18L, 18R) for stereoscopically capturing a physical space and outputting a pair of stereoscopic images; display means (13L, 13R, 20L, 20R) for displaying an image for a right eye and an image for a left eye based on said pair of stereoscopic images, wherein said display means includes left eye display means and right eye display means, and wherein said left eye display means and one of said pair of image-sensing means (18L, 18R), and said right eye display means and the other of said pair of image-sensing means are integrated, respectively; and an adjustment mechanism for moving said left eye display means and the one of said pair of image-sensing means, and said right eye display means and the other of said pair of image-sensing means so as to change the base line length of said pair of image-sensing means, characterized by further comprising non-volatile storage means (26L, 26R) storing image sensing parameters for generating parallax images of a virtual object to be superimposed on the pair of stereoscopic images and having the same parallax as said pair of stereoscopic images taking into account the difference between the actual and the design values of the image sensing parameters, said parameters as previously measured for said pair of image sensing means to take into account said difference, wherein the image sensing parameters are previously measured for each of a plurality of base line lengths, stored in said storage means associated with the respective base line length, and include the base line length of said pair of image-sensing means and the convergence angle (θ, θ') of each of the image-sensing means; acquisition means (23L, 23R) for acquiring the image sensing parameters from said storage means (26L, 26R); and generation means (22L, 22R) for generating the parallax images of the virtual object using the image sensing parameters that are acquired and three-dimensional model information. a pair of image-sensing means (18L, 18R) for stereoscopically capturing a physical space and outputting a pair of stereoscopic images; display means (13L, 13R, 20L, 20R) for displaying an image for a right eye and an image for a left eye based on said pair of stereoscopic images, wherein said display means includes left eye display means and right eye display means, and wherein said left eye display means and one of said pair of image-sensing means (18L, 18R), and said right eye display means and the other of said pair of image-sensing means are integrated, respectively; and an adjustment mechanism for moving said left eye display means and the one of said pair of image-sensing means, and said right eye display means and the other of said pair of image-sensing means so as to change the base line length of said pair of image-sensing means, characterized by further comprising non-volatile storage means (26L, 26R) storing image sensing parameters for generating parallax images of a virtual object to be superimposed on the pair of stereoscopic images and having the same parallax as said pair of stereoscopic images taking into account the difference between the actual and the design values of the image sensing parameters, said parameters as previously measured for said pair of image sensing means to take into account said difference, wherein the image sensing parameters are previously measured for each of a plurality of base line lengths, stored in said storage means associated with the respective base line length, and include the base line length of said pair of image-sensing means and the convergence angle (θ, θ') of each of the image-sensing means; acquisition means (23L, 23R) for acquiring the image sensing parameters from said storage means (26L, 26R); and generation means (22L, 22R) for generating the parallax images of the virtual object using the image sensing parameters that are acquired and three-dimensional model information.