Network management apparatus for priority channel assignment to acquire available channels in frequency sharing and method thereof

A network management method for priority channel assignment to acquire available channels in a frequency sharing band, the method comprising:

• measuring, by a signal intensity measurer, a received signal intensity for an input signal;
• verifying, by a controller, usable candidate channels in the same channel and an adjacent channel of a TV band device (TVBD) for each predetermined frequency based on the measured received signal intensity;
• verifying, by the controller, available channels of the TVBD based on the verified usable candidate channels in the same channel and the adjacent channel;
• calculating, by the controller, the decreased number of available channels of the TVBD predicted for each channel after channel reassignment;
• and
• assigning, by the controller, channels to be reassigned based on the calculated decreased number of available channels of the TVBD.