Abstract: The present invention relates to a method for determining a billing target in employees' terminal in order to bill the communication charges. According to the present invention, there is a method for determining a billing target in a first subscriber's terminal in order to bill the first subscriber's communication charge, the method comprising the steps of: receiving a business connection data from a second subscriber corresponding to the first subscriber, wherein the business connection data comprises business connection access information and billing target information for billing, storing the received business connection data in a storage and updating the billing target by use of the billing target information, wherein the charge for communication service through the business connection access information is billed the billing target.

Abstract: The present invention relates to a display structure modification system and its method characterized by receiving a display structure modification command from the user, searching and indicating at least one display structure data previously stored on the display of the telecommunication apparatus, and modifying the screen establishment of the telecommunication apparatus into the display structure data corresponding to the selection command to any display structure data inputted by the user. The present invention provides the method that the display structure of the liquid crystal display is diversely constructed according to the user's individuality and the method that conveniences of the usage of the user's mobile telecommunication terminal are sought after by enabling an application hotkey establishment to be set up according to the user's intent.