a processing unit, configured to:

detect a rehabilitation action of the user based on a change in a position of the user;

generate, in a three-dimensional virtual space, an avatar object that moves in accordance with the detected rehabilitation action, a target object representing a three-dimensional target rehabilitation action, and a separate visual recognition object that surrounds the target object to identify a position of the target object, wherein the visual recognition object is a circle and the target object is a circle, the visual recognition object having a larger radius than a radius of the target object, the target object located at a center of the visual recognition object;

request the target rehabilitation action displayed on a display screen in accordance with a task;

compare the detected rehabilitation action and a target position represented by the target object, and evaluate the rehabilitation capability of the user; and

perform feedback that stimulates at least two of five senses to the user who has achieved the target rehabilitation action in synchronism with evaluation of achievement of the target rehabilitation action of each time substantially at the same time as a timing of achieving the target rehabilitation action,

wherein the task includes information relating to a size, position, and speed of the target object, and a size of the avatar object.