A non-transitory computer-readable recording medium having recorded thereon a program that causes a computer to execute a method to display an image of a predetermined process on a body-mounted display device worn by a user, the method includes tracking a head or the like of the user, and calculating the position and the direction of the head or the like; displaying the image of the predetermined process in a virtual space of the display device; determining that the user is in the sleeping state when a candidate state, in which at least either of the calculated position and direction of the head or the like of the user is shifted by greater than or equal to a predetermined set amount, continues for greater than or equal to a predetermined set period; and performing a predetermined sleeping countermeasure process when the user is determined to be in the sleeping state.