the second wireless device 310 set respective beam directions and sense each other 39 s existence based on the user input so that all operations performed in a general searching process between wireless devices e g searching neighboring wireless devices setting a beam direction or the like may be optional and the mmwave short distance wireless communication can be performed referring to fig3 b the first wireless device 300 may sense the data reception graphic image which indicates the antenna beam direction being rotated in the left direction by a user input 311 and a beam direction 312 to the left direction in which the data reception graphic image is rotated in addition the second wireless device 310 may sense the content being dragged to the 2 o 39 clock position by a user input 313 and set a beam direction 314 to the 2 o 39 clock position thereafter the second wireless device 310 which is the transmission device may transmit a probe request signal in the set beam direction 314 the first wireless device 300 receives the probe request from the second wireless device 310 estimates a cir value 315 and determines whether a los based on the estimated cir exists if the cir value indicates that a los does not exist the first wireless device 300 either may transmit a negative acknowledge character nack or may not transmit a response signal in this case at least one of the first.