An image acquisition unit of an information processing device acquires data for moving image including an image of a user and captured by an image capturing device. An initial processing unit determines correspondence between an amount of movement of the user and a parameter defining an image to be ultimately output in a conversion information storage unit. A tracking processing unit uses a particle filter to perform visual tracking in the moving image so as to estimate the magnification and translation amount of the user's head contour. The input value conversion unit converts the amount of movement of the user into the parameter defining an image using the magnification and the translation amount as parameters. The output data generation unit generates an image based on the parameter. The output control unit controls the generated image so as to be displayed on a display device.