Abstract: A data transmission and receiving system in a mobile communication system is provided. The system includes a first data providing server which contains detailed data and to which a user gets an access by inputting a predetermined code or number through a mobile communication terminal; a second data providing server which contains a simplified data including the predetermined code or number information associated with the detailed data; and a mobile communication terminal including a user interface that allows a user access to the second data providing server to search the simplified data to access the detailed data in the first data providing server, wherein the user interface includes a search section allowing a user to input certain keyword data to search simplified data associated with the keyword data from the second data providing server and a data display section for displaying the simplified data searched by the searching section.