PURPOSE: To simplify the transmission procedure when an electronic mail is sent to a decided destination in the work station equipment provided with an electronic mail function.

CONSTITUTION: The work station equipment in which a transmission box icon and an object icon representing an object of transmission are displayed on a display screen of a display device and an electronic mail function implementing a transmission command of an electronic mail is provided by selecting an object icon and overlapping it onto transmission box icon is provided with a means storing destination information set corresponding to transmission box icons 12a-12c, a means expanding the destination information as destination information of data main body corresponding to the object icon such as document icons 11a 11b when the transmission of an electronic mail is commanded. and a means implementing transmission processing of the data main body based on the expanded destination information.