An upper node and a lower node which communicate with each other in a wireless network, and a computer readable recording medium including a program for executing a communication method thereof, are provided. The upper node determines priorities of the plurality of lower nodes and transmits a beacon message including information on the priorities determined by the upper node to the plurality of lower nodes, and the plurality of lower nodes determine priorities based on the beacon message received from the upper node. The upper node transmits first data to the plurality of lower nodes in a first period of an active period in an indirect data transmission method, and the plurality of lower nodes transmit second data to the upper node based on the determined priorities in a second period of the active period, in which the lower nodes communicate with the upper node, in a direct data transmission method. Accordingly, waste of battery power in the lower node can be prevented.