1. A method for supporting input of one or more execution parameters of predetermined software in an input field, comprising: receiving input of a text character string including one or more execution parameters in the input field displayed on a display device; displaying on the display device one or more execution options of said predetermined software in such a manner that a user can select the options in response to selection of a part of said text character string by the user, said one or more execution options displayed varying with the type of selection of the part of said text character string; and transforming said text character string so as to include at least one of said one or more execution options selected and displaying the transformed text character string on the display device.