System for transmitting reference signal

PURPOSE: A system for transmitting a channel state information reference signal is provided to easily transmit a channel state information reference signal to transmit data between a base station and the relay. CONSTITUTION: A base station(900) includes a channel state information reference signal pattern information transmitting unit(910) and a transmitting unit(920). The channel state information reference signal pattern information transmitting unit transmits information about a sub frame including a channel state information reference signal among sub frames to a terminal(930) or a relay(940). The transmitting unit transmits the channel state information reference signal and data to the terminal or the relay by referring to the information for the sub frame.