A method of service synchronization, sharing and multi-device control in a digital home, comprising: providing a plurality of subservices being suitable for different types of terminal devices in a webpage of a WEB server, and a webpage of a WEB service comprises the different subservices, and splitting the WEB service into subservices with synchronous relations by a relay device located between a web server and the terminal devices; when the WEB service is requested, conveying the subservices to the respective terminal devices; wherein the relay device comprises at least a browser and a web server module; wherein the method further comprises the following steps: 1) storing a main service webpage of the WEB service in the web server, and the main service webpage of the WEB service comprises different subservices, wherein the main service webpage of the WEB service is defined by a predefined way of subservice splitting and comprises a plurality of subservices with synchronous relations being suitable for different types of terminal devices; 2) requesting the main service webpage from the web server by the relay device and splitting it into a plurality of subservice webpages for different terminal devices; 3) sending access requests to the relay device by the respective terminal devices; 4) returning corresponding subservice webpages by the relay device according to the types of the terminal devices sending the requests; and 5) performing relevant processes in the subservice webpages by the respective terminal devices after receiving the subservice webpages, and maintaining communication with the relay device to ensure synchronized sharing between the subservice webpages and the main service webpage. providing a plurality of subservices being suitable for different types of terminal devices in a webpage of a WEB server, and a webpage of a WEB service comprises the different subservices, and splitting the WEB service into subservices with synchronous relations by a relay device located between a web server and the terminal devices; when the WEB service is requested, conveying the subservices to the respective terminal devices; wherein the relay device comprises at least a browser and a web server module; wherein the method further comprises the following steps: 1) storing a main service webpage of the WEB service in the web server, and the main service webpage of the WEB service comprises different subservices, wherein the main service webpage of the WEB service is defined by a predefined way of subservice splitting and comprises a plurality of subservices with synchronous relations being suitable for different types of terminal devices; 2) requesting the main service webpage from the web server by the relay device and splitting it into a plurality of subservice webpages for different terminal devices; 3) sending access requests to the relay device by the respective terminal devices; 4) returning corresponding subservice webpages by the relay device according to the types of the terminal devices sending the requests; and 5) performing relevant processes in the subservice webpages by the respective terminal devices after receiving the subservice webpages, and maintaining communication with the relay device to ensure synchronized sharing between the subservice webpages and the main service webpage. 1) storing a main service webpage of the WEB service in the web server, and the main service webpage of the WEB service comprises different subservices, wherein the main service webpage of the WEB service is defined by a predefined way of subservice splitting and comprises a plurality of subservices with synchronous relations being suitable for different types of terminal devices; 2) requesting the main service webpage from the web server by the relay device and splitting it into a plurality of subservice webpages for different terminal devices; 3) sending access requests to the relay device by the respective terminal devices; 4) returning corresponding subservice webpages by the relay device according to the types of the terminal devices sending the requests; and 5) performing relevant processes in the subservice webpages by the respective terminal devices after receiving the subservice webpages, and maintaining communication with the relay device to ensure synchronized sharing between the subservice webpages and the main service webpage.