Abstract: An automatic multimedia searching method and the multimedia downloading system thereof are provided, which are capable of increasing user's convenience on multimedia searching and downloading events. The method includes the following steps. First, an electronic device which stores a multimedia file and a data source connection are provided. Next, a multimedia file is played. When playing the multimedia file, the electronic device automatically searches the data source for multimedia files having the same content as the content of the information tag in the multimedia file. Finally, the found multimedia files are displayed on the electronic device.