A re-transmission controlling method and a wireless communication terminal are provided to prevent a transitional high-load state on the data receiving side in a wireless transmission system employing the HSDPA method, for example. In the case where a correct data packet has been determined based on a result of error-correction decoding of a data packet received, the correct data packet is disassembled into predetermined data units and are sent to an upper layer; and when the packet sequence number of a correct data packet received is not continuous, after the received data packet having a discontinuous number is disassembled into the predetermined data units to be sent to the upper layer, the data disassembled into the data units are temporarily stored, and the temporarily stored data is sent to the upper layer without applying disassembly processing when the missing correct data packet due to the discontinuity is received.