A wearable electronic device includes a display, and at least one processor connected to the display, where the at least one processor is configured to obtain a first space necessary for a motion of a user corresponding to a motion of an avatar, the motion of the avatar being performed in a virtual space of virtual reality (VR) content displayed through the display, obtain a second space for safely performing the motion of the user, set a scale value, based on the first space and the second space, and based on obtaining the motion of the user, determine, using the set scale value, a size of the motion of the avatar, the motion of the avatar being performed by the motion of the user.