A method for modifying a virtual reality (VR) space, which generates a mutual movable space between an augmented reality (AR) host's reference space and a VR client's space, the method comprising:
- acquiring a size of the AR host's reference space;
- estimating a relative translation gain threshold by adjusting the client's walking speed for each axis of the VR space according to the size of the reference space;
- and
- generating the mutual movable space in which movement is possible in mixed reality (MR) with a relative translation gain based on the relative translation gain threshold.