Information terminal apparatus

An information terminal apparatus (10) having instructions stored data (200) of the server (1) is connected. For instruction data received (200) determination unit (104) determines the corresponding application. Analysis unit (105) analyzes the command data (200). An operation control unit (106) extracts the message data from the instruction data (200). An application executing unit (107) operating in accordance with the application program instructions and data. A display unit (19) displays the message represented by the message data based on execution of the application. By performing the checking unit is further provided, it is possible to determine whether the application is executed based on the message data.