System and method for managing resource in communication system

A system for managing resources in a communication system including a plurality of systems which do not have a permission for a first frequency band, the system comprising:

• a coexistence manager configured to, when a frequency band available for the plurality of systems is searched from the first frequency band, manage the plurality of systems for coexistence and frequency sharing of the plurality of systems in the available frequency band;
• a coexistence enabler configured to transmit and receive information of the plurality of systems and information of the coexistence manager;
• and
• a coexistence discovery and information server configured to support control of the coexistence manager over the plurality of systems,
• wherein a plurality of coexistence managers are provided to respectively correspond to the plurality of systems, and
• wherein, among the plurality of coexistence managers, a first coexistence manager selects a mode from among an etiquette mode, a round-robin mode and a competition mode as a negotiation procedure based on the available frequency band, and performs a negotiation procedure with coexistence managers neighboring to it, on the basis of the mode selected by the coexistence managers from among an etiquette mode, a round-robin mode and a competition mode.