To provide an apparatus and a method for performing a protocol that optimizes a transmission power so that communication is performed between nodes in point-to-multipoint communication (1:N) capable of reducing the consumption of the transmission power while maintaining the communication quality at a proper level.

The transmission power optimizing apparatus in the network includes a communication unit for sending and receiving a data packet through air, and a control unit that outputs a control signal for controlling the transmission power according to connection information of the data packet received through the communication unit. The connection information includes the reception signal strength and / or link quality information.