The invention is suitable for the field of switches, and provides an input and output switching method and a switch. The method comprises the following steps: receiving switching commands sent by a first control end and a second control end, wherein the switching commands include unique identifiers of information source output equipment and unique identifiers of information source display equipment, and the information source output equipment and the information source display equipment are HDMI (High Definition Multimedia Interface) equipment; judging whether the unique identifiers of the information source display equipment included in different switching commands are the same or not; if so, acquiring priorities of the first control end and the second control end; and selecting the information source output equipment which corresponds to the unique identifiers of the information source output equipment included in the switching command transmitted by the control end with a higher priority, and transmitting information of the information source equipment to the information source display equipment which corresponds to the unique identifiers of the information source display equipment included in the switching command transmitted by the control end with the higher priority to display the information. Through adoption of the method, the quantity of connected HDMI equipment can be increased.