According to one embodiment of the present invention, provided is a method in which a server enabling heterogeneous wireless devices to coexist in an equal frequency band selects a master management device among multiple management devices for coexistence. The method for selecting a master management device may include: receiving from a server a request message from a certain management device among the multiple management devices; selecting a master-candidate device among the multiple management devices in response to reception of the request message; transmitting, to the selected candidate device, a request message for requesting the selected candidate device to take charge of a master management device; receiving a response message from the selected candidate device; selecting the selected candidate device as a master management device when the response message includes an acceptance response; and transmitting an announcement message including the result of the selection to the multiple management devices.