A virtual reality system, comprising: a host device; a transmission cable; and a head mounted display apparatus adapted to be worn by a user and coupled to the host device via the transmission cable, comprising: a multimedia module, adapted to receive multimedia content from the host device via the transmission cable, and to display a video part of the multimedia content; a multi-sensing module, adapted to obtain sensing information regarding the head mounted display apparatus and the user, wherein the sensing information comprises position information, user information and environment information comprising an obstruction to the user's movement; and a peripheral hub, adapted to provide the sensing information to the host device via the transmission cable, wherein the host device is adapted to adjust at least one virtual object (VO1, VO2, VO3, VO4, VO5, VO6, VO7, VO8, VO9, VO10, VO11) of the video part of the multimedia content in response to the sensing information, wherein the host device comprises a computing device adapted to generate the multimedia content according to a multimedia source and to the sensing information received from the head mounted display apparatus, wherein the computing device is adapted to generate communication data according to the sensing information, wherein the multi-sensing module comprises: a position sensing device, obtaining position information corresponding to the head mounted display apparatus; a user sensing device obtaining user information of the user; and an environment sensing device, obtaining environment information corresponding to the obstruction,wherein the multi-sensing module obtains the sensing information according to the position information, the user information, and the environment information; wherein: the position information comprises movement information, orientation information, tilt angle information, and/or location information of the head mounted display apparatus; the user information comprises biometrical information about the user and/or eye view information; and the environment information comprises images/video and/or depth information captured by the environment sensing device. a host device; a transmission cable; and a head mounted display apparatus adapted to be worn by a user and coupled to the host device via the transmission cable, comprising: a multimedia module, adapted to receive multimedia content from the host device via the transmission cable, and to display a video part of the multimedia content; a multi-sensing module, adapted to obtain sensing information regarding the head mounted display apparatus and the user, wherein the sensing information comprises position information, user information and environment information comprising an obstruction to the user's movement; and a peripheral hub, adapted to provide the sensing information to the host device via the transmission cable, a multimedia module, adapted to receive multimedia content from the host device via the transmission cable, and to display a video part of the multimedia content; a multi-sensing module, adapted to obtain sensing information regarding the head mounted display apparatus and the user, wherein the sensing information comprises position information, user information and environment information comprising an obstruction to the user's movement; and a peripheral hub, adapted to provide the sensing information to the host device via the transmission cable, wherein the host device is adapted to adjust at least one virtual object (VO1, VO2, VO3, VO4, VO5, VO6, VO7, VO8, VO9, VO10, VO11) of the video part of the multimedia content in response to the sensing information, wherein the host device comprises a computing device adapted to generate the multimedia content according to a multimedia source and to the sensing information received from the head mounted display apparatus, wherein the computing device is adapted to generate communication data according to the sensing information, a position sensing device, obtaining position information corresponding to the head mounted display apparatus; a user sensing device obtaining user information of the user; and an environment sensing device, obtaining environment information corresponding to the obstruction,wherein the multi-sensing module obtains the sensing information according to the position information, the user information, and the environment information; wherein: the position information comprises movement information, orientation information, tilt angle information, and/or location information of the head mounted display apparatus; the user information comprises biometrical information about the user and/or eye view information; and the environment information comprises images/video and/or depth information captured by the environment sensing device. the position information comprises movement information, orientation information, tilt angle information, and/or location information of the head mounted display apparatus; the user information comprises biometrical information about the user and/or eye view information; and the environment information comprises images/video and/or depth information captured by the environment sensing device.