A method and apparatus for native method invocation and changing memory bank. A method return frame of a smart card stores the status of a native method invocation, and a memory bank flag points a program counter to a runtime environment (RE) memory bank or an operating system (OS) memory bank. First, upon a method invocation, the method return frame is pushed and set as a native method invocation when the method invocation is the native method invocation. Then, the memory bank flag points the program counter to the OS memory bank. Next, the method return frame is popped after the native method has been executed. Finally, the memory bank flag is changed to point the program counter to the RE memory bank if the method return frame is set as the native method invocation.