An intelligent voice system comprising: a voice assistant; a cloud service platform, connected to the voice assistant and adapted to manage the voice assistant; a projector, configured to project a video platform interface, and a management server, connected to the cloud service platform and the projector and configured to manage and control the projector, wherein when the voice assistant receives a first voice signal for controlling the video platform interface, the voice assistant is configured to extract a plurality of first keywords from the first voice signal and to forward the plurality of first keywords to the cloud service platform, wherein the plurality of first keywords comprises an alias corresponding to the projector and a first interface control command (ICMD1), and wherein the cloud service platform comprises a semantic analyzing program and the cloud service platform comprises a plurality of second interface control commands (ICMD2), the cloud service platform is configured to analyze the first interface control command (ICMD1) according to the semantic analyzing program, to acquire the corresponding second interface control command (ICMD2) according to the first interface control command (ICMD1), and to transmit the alias of the projector and the second interface control command (ICMD2) corresponding to the first interface control command (ICMD1) to the management server, and the management server is configured to access the projector in response to the alias and to adjust a projection situation of the video platform interface projected by the projector, wherein the projector comprises a first application, wherein the second interface control command (ICMD2) comprises a bookmark adding command and a first designated bookmark name, and when the video platform interface projected by the projector comprises a first video content, the first application marks the first video content as the first designated bookmark name in the video platform interface according to the bookmark adding command, and wherein the second interface control command (ICMD2) further comprises a bookmark play command and a second designated bookmark name, and the first application controls the video platform interface to play a second video content of the second designated bookmark name according to the bookmark play command. a voice assistant; a cloud service platform, connected to the voice assistant and adapted to manage the voice assistant; a projector, configured to project a video platform interface, and a management server, connected to the cloud service platform and the projector and configured to manage and control the projector, wherein when the voice assistant receives a first voice signal for controlling the video platform interface, the voice assistant is configured to extract a plurality of first keywords from the first voice signal and to forward the plurality of first keywords to the cloud service platform, wherein the plurality of first keywords comprises an alias corresponding to the projector and a first interface control command (ICMD1), and wherein the cloud service platform comprises a semantic analyzing program and the cloud service platform comprises a plurality of second interface control commands (ICMD2), the cloud service platform is configured to analyze the first interface control command (ICMD1) according to the semantic analyzing program, to acquire the corresponding second interface control command (ICMD2) according to the first interface control command (ICMD1), and to transmit the alias of the projector and the second interface control command (ICMD2) corresponding to the first interface control command (ICMD1) to the management server, and the management server is configured to access the projector in response to the alias and to adjust a projection situation of the video platform interface projected by the projector, wherein the projector comprises a first application, wherein the second interface control command (ICMD2) comprises a bookmark adding command and a first designated bookmark name, and when the video platform interface projected by the projector comprises a first video content, the first application marks the first video content as the first designated bookmark name in the video platform interface according to the bookmark adding command, and wherein the second interface control command (ICMD2) further comprises a bookmark play command and a second designated bookmark name, and the first application controls the video platform interface to play a second video content of the second designated bookmark name according to the bookmark play command.