A method for filling a form of a web page stored in a Web server (1) includes the steps of: providing an application server (2) for receiving parameter values; searching and obtaining to-be-posted new data from a database (3) according to the parameter values; matching the to-be-posted new data with one or more corresponding input fields of the form of the Web page according to the parameter values; accessing the Web page of the Web server; filling up the corresponding input fields with the to-be-posted new data; and activating the form of the Web page in order to post data of the corresponding input fields to the Web server. A related system is also provided.