A communication interface method for an SE equipped on a mobile terminal and an SE using the same are provided. The communication interface method includes: connecting, by a communication manager installed in an SE equipped on a mobile terminal, to a server via the mobile terminal; and executing, by the communication manager, communication processes between an applet which is installed in the SE separately from the communication manager, and the server. Accordingly, since the communication processes between the applet and the server are executed by the separate communication manager other than the applet, the processing function is omitted from the applets so that the applets can be simplified.