Patent ID: 7712040

Claim:
An information terminal device having a function for reserving mail, the information terminal device comprising: an operation unit for operating the information terminal device; a communication unit for transmitting a reserving mail to a network and for receiving a returned reserving mail from the network; a display having a first partial field for displaying a transmission error message and a second partial field for displaying an image corresponding to an activated application program; and a controller detecting the returned reserving mail from the network and if an application program is active, preventing the transmission error message from overlaying the displayed image corresponding to the activated application program in the second partial field by displaying the transmission error message in the first partial field upon detecting the returned reserving mail, displaying an editing screen for editing the returned reserving mail when the operation unit is operated while the transmission error message is displayed in the first partial field, if the operation unit is not operated within a certain period of time during which the transmission error is displayed in the first partial field, turning off the displaying of the transmission error message in the first partial field, and in an application program is not active upon detecting the returned reserving mail, continuously displaying the transmission error message until the operation unit is operated.