To perform operation similar to the case of remote log-in with electronic mail.

This method is provided with a text extraction process S1 for extracting the text of electronic mail when that electronic mail is received and the destination of this electronic mail is a predetermined address for remote operation, a command execution control process S5 for changing the standard output of an operating system(OS) into predetermined file name and dispatching the mail text to the above OS when that mail text is extracted in this text extraction process S1 and a standard output return process S7 for returning the file of the file name storing the standard output of the OS corresponding to a command, the execution of which is controlled in this command execution control process, to the transmission source of that mail text.