Abstract: A dynamic address allocation method includes allowing a new terminal that desires to participate in the ad hoc network to broadcast an address block request message to neighbor terminals in order to be allocated with an address; allowing the new terminal to receive a plurality of address block reply messages from the neighbor terminals; allowing the new terminal to transmit an address block confirmation message to a 1-hop neighbor terminal in a normal state that has a largest address block on the basis of the plurality of address block reply messages; allowing the new terminal to receive an address block completion message, which includes bitmap information for an available address block, from the 1-hop neighbor terminal; and allowing the new terminal to be allocated with the address and to change its terminal state from an alone state to a normal state.