A system, mobile device and method for displaying a medical image using multiple mobile devices are disclosed. A master mobile device for displaying a medical image includes a communication unit, a device information collection unit, and an arrangement designation unit. The communication unit wirelessly communicates with surrounding mobile devices and a medical image provision system. The device information collection unit searches for surrounding slave mobile devices that are to operate as slaves via the communication unit, collects the device information of each of the retrieved slave mobile devices while communicating with the retrieved slave mobile devices, and control the communication unit to transmit device information of the master mobile device and the collected device information to the medical image provision system. The arrangement designation unit receives recommended arrangement information from the medical image provision system, and outputs the recommended arrangement information.