Abstract: A method for executing a Java application midlet using communication among Java applications is provided. The method includes storing information about a predetermined Java application; receiving the name of an object or the name of a mathematical function from a Java application downloaded through a wireless network and retrieving an object or mathematical function corresponding to the received name; and providing the object or the mathematical function to the downloaded Java application to execute the downloaded Java application. Accordingly, support of mathematical functions can be accomplished among Java objects, one Java object can call another Java object, and the amount of data downloaded from a web server and downloading time can be reduced.