An information processing system for controlling movements of a character (200) in a virtual three-dimensional space, comprising movement control unit (231) that controls the movements of the character (200), and a switching determination unit (232) that determines switching of the movement of the character (200) by the movement control unit (231) between a three-dimensional movement in the virtual three-dimensional space and a movement in a predetermined surface (211) provided in the virtual three-dimensional space. The movement control unit (231) determines a speed of the character (200) after the switching on the basis of a speed of the character (200) before the switching when the switching is performed between the three-dimensional movement in the virtual three-dimensional space and the movement in the predetermined surface (211).