A KVM switch is disclosed. The KVM switch, for connecting between computers and at least one peripheral device, the KVM switch includes a first interface, second interfaces, a controller and device emulators. The controller is configured to receive a peripheral signal and generate a first serial signal and a second serial signal. Each of the device emulators is configured to receive the first serial signal with the a target address and the second serial signal with a second target address, and each of the device emulators is guided by unique address to one of the computers, respectively, wherein, when the device emulators receive the first serial signal and the second serial signal, the device emulators are configured to determine whether to process the first serial signal and the second serial signal by comparing the first target address and the second target address with the unique address.