Abstract: A switch apparatus for multiple High Definition Multimedia Interface (HDMI) sources comprises: at least two input units, each associated to an electronic product that provides HDMI signals; at least one output unit associated to a HDMI compatible audio-visual equipment; an automatic detecting/switching unit for automatically detecting an activated HDMI signal source and electrically connect the related input unit with said output unit to screen the audio/video thereof through the audio-visual equipment. By utilizing the switch apparatus to integrate multiple electronic products as HDMI signal sources with least one HDMI compatible audio-visual equipment accomplishes an integrated system of HDMI products that share single audio-visual equipment for presenting the contents played therethrough.