mouse transmission unit a 310 that transmits an input signal to a receiving unit a 220 of a receiver a 200 a mouse transmission unit b 311 that transmits the input signal to a receiving unit b 221 of a receiver b 201 a mouse control unit a 330 that controls input output signal processing of the wireless mouse a 300 and the modules in the wireless mouse a 300 and a channel selection button a 360 and a channel selection button b 361 that allows a user to select a desired computer a wireless keyboard of the present invention a 400 is constituted by a keyboard transmission unit a 410 that transmits the input signal to the receiving unit a 220 of the receiver a 200 a keyboard transmission unit b 410 that transmits the input signal to the receiving unit b 221 of the receiver b 200 and a keyboard control unit a 430 that controls the input output signal processing of the wireless keyboard a 400 and the modules in the wireless keyboard a 400 the receiver a 200 is connected to a computer a 100 and the receiver b 201 is connected to a computer b 101 the receiver a 200 is constituted by the receiving unit a 220 that receives the signals transmitted from the mouse transmission unit a 310.