An Internet facsimile apparatus connectable to a local area network, LAN, the apparatus further comprising: a control panel on which a user enters an mail address of a destination (4, 8) using address buttons, each of which corresponding to a destination mail address, means for allowing a user to input and set destination mail addresses and a scanner flag to be associated with each other, a memory (13, 902) that registers the input destination mail addresses and scanner flags, wherein the scanner flag associated with a destination mail address indicates whether the destination mail address is used for Internet facsimile transmission processing or network scanner processing on the LAN, determining means for determining to perform Internet facsimile transmission processing when the destination mail address, which one of the address buttons pressed by the user corresponds to, is used for Internet facsimile transmission processing and determining to perform network scanner processing when the destination mail address, which one of the address buttons pressed by the user corresponds to, is for network scanner processing, with reference to the scanner flag associated with the destination mail address corresponding to the address button pressed by the user; scanning means for scanning an original to obtain image data; header creating means (605, 607) for creating header information when the determining means (604, 905, 1303, 1502, 1702) determines to perform Internet facsimile transmission processing; adding means for adding the header information created by the header creating means (605, 607) to the image data obtained by the scanning means; email creating means for creating, when the determining means (604, 905, 1303, 1502, 1702) determines to perform the Internet facsimile transmission processing, an email to which the image data with the header information added by the adding means is attached, and for creating, when the determining means (604, 905, 1303, 1502, 1702) determines to perform network scanner processing, an email to which the image data without header information is attached; and transmitting means for transmitting the email created by the emaol creating means to the entered mail address of the destination via the LAN. a control panel on which a user enters an mail address of a destination (4, 8) using address buttons, each of which corresponding to a destination mail address, means for allowing a user to input and set destination mail addresses and a scanner flag to be associated with each other, a memory (13, 902) that registers the input destination mail addresses and scanner flags, wherein the scanner flag associated with a destination mail address indicates whether the destination mail address is used for Internet facsimile transmission processing or network scanner processing on the LAN, determining means for determining to perform Internet facsimile transmission processing when the destination mail address, which one of the address buttons pressed by the user corresponds to, is used for Internet facsimile transmission processing and determining to perform network scanner processing when the destination mail address, which one of the address buttons pressed by the user corresponds to, is for network scanner processing, with reference to the scanner flag associated with the destination mail address corresponding to the address button pressed by the user; scanning means for scanning an original to obtain image data; header creating means (605, 607) for creating header information when the determining means (604, 905, 1303, 1502, 1702) determines to perform Internet facsimile transmission processing; adding means for adding the header information created by the header creating means (605, 607) to the image data obtained by the scanning means; email creating means for creating, when the determining means (604, 905, 1303, 1502, 1702) determines to perform the Internet facsimile transmission processing, an email to which the image data with the header information added by the adding means is attached, and for creating, when the determining means (604, 905, 1303, 1502, 1702) determines to perform network scanner processing, an email to which the image data without header information is attached; and transmitting means for transmitting the email created by the emaol creating means to the entered mail address of the destination via the LAN.