1. A non-transitory computer-readable storage medium having stored therein a display control program to be executed by a computer of a display control apparatus for displaying a predetermined virtual world on a display apparatus capable of performing stereoscopic display, the display control program causing the computer to execute: acquiring an output based on a parallax adjustment for, in accordance with a user operation, adjusting a parallax with which a stereoscopic image is displayed on the display apparatus; in accordance with the output based on a parallax adjustment, adjusting a parallax with which the virtual world is stereoscopically displayed, and (i) if the parallax is adjusted so as to gradually increase, setting a level of blurring with which at least part of the virtual world is stereoscopically displayed, such that the level of blurring gradually increases, and (ii) if the parallax is adjusted so as to gradually decreases, setting the level of blurring with which at least part of the virtual world is stereoscopically displayed, such that the level of blurring gradually decreases; and generating, on the basis of the parallax, a stereoscopic image in which the virtual world is stereoscopically displayed, by blurring at least part of the virtual world in accordance with the level of blurring set corresponding to the adjusted parallax.