A video data decoding method and apparatus for high-speed reproduction of variable length encoded video information is provided to realize a more acceptable high-speed reproduced picture within a faster time. An ink cartridge has a joint section which is connected to a printing head unit when the inks are supplied to the printing head unit. As a result, the present invention is capable of fully utilizing the light from the semiconductor-type light source and facilitating a light distribution design for forming the light in a predetermined light distribution pattern. The mail enhancement server then modifies each outgoing email to include a tracking code.