Apparatus and method for setting hybrid automatic repeat request and automatic repeat request parameter

PURPOSE: A device and method for setting HARQ and ARQ parameters are provided to optimally set HARQ and ARQ parameters, thereby enhancing HARQ performance and UM performance. CONSTITUTION: An HARQ parameter setting unit(110) determines a setup condition of a default HARQ parameter using a QCI(Quality Collaboration Index) feature. The HARQ parameter setting unit sets a default HARQ parameter which satisfies the determined setup condition of the default HARQ parameter. An ARQ parameter setting unit(130) determines a setup condition of a default ARQ parameter using the QCI feature. The ARQ parameter setting unit sets a default ARQ parameter which satisfies the determined setup condition of the default ARQ parameter. A parameter updating unit(150) updates the set default HARQ and ARQ parameters according to a channel state of a terminal.