Patent attributes
To enable a state of an object to be changed based on a relationship between a line of sight of a user wearing a head-mounted display and a position of the object arranged in a virtual space, a specific object is arranged at a predetermined position in the virtual space. A determination is made whether the specific object is located outside a certain range from the line of sight of the user wearing the head-mounted display for a first predetermined period. Then, when the specific object is located outside the certain range from the line of sight of the user for the first predetermined period, a sound associated with the specific object is generated.