Effective management of a Hybrid-Automatic Repeat reQuest (HARQ) buffer in a wireless communication system is provided. A receiving terminal includes a first memory for storing Log Likelihood Ratio (LLR) values of at least one data block comprised in a received HARQ burst in a first memory, a channel decoder for decoding the at least one data block by using the LLR values, an error detection unit for detecting whether there are errors in the decoded at least one data block, and a second memory for storing at least one error-free data block in a decoded state among the data blocks in a second memory.