A method for transmitting a channel state information reference signal, CSI-RS, of a base station (900, 1300, 1500) in a communication system, the method comprising: transmitting CSI-RS configuration information including information on a component CSI-RS configuration to a terminal (103, 904, 905, 906, 1303, 1503); transmitting feedback configuration information to the terminal; transmitting the CSI-RS according to the CSI-RS configuration information; and receiving feedback information generated based on the CSI-RS received by the terminal, and wherein an aggregated CSI-RS antenna port index p for the CSI-RS is determined based on an index i of the component CSI-RS configuration, a total number (N res CSI) of component CSI-RS configurations which are aggregated, a number (N CSI ports) of antenna ports included in each component CSI-RS configuration, an antenna port index p' in each component CSI-RS configuration, a number (N 1) of at least one antenna port of a first direction and a number (N 2) of at least one antenna port of a second direction in an antenna array of the base station, and a number (N 1 Config) of at least one antenna port in the first direction and a number (N 2 Config) of at least one antenna port in the second direction of the component CSI-RS configuration, in case that a length of an orthogonal code is 4 and the number (N 2 Config) of at least one CSI-RS antenna port of the second direction in the component CSI-RS configuration is different from the number (N 2) of at least one antenna port of the second direction in the antenna array of the base station, wherein the aggregated CSI-RS antenna port index depends on a maximum number of CSI-RS antenna ports that the terminal is capable of recognizing, and wherein the aggregated CSI-RS antenna port index p is indexed in accordance with mathematical expression p = p ′ + N ports CSI N 1 Config i for p ′ ∈ 15,..., 15 + N ports CSI N 1 Config − 1 and i < N res CSI / 2 p ′ + N ports CSI N 1 Config i + N 2 − N 2 Config for p ′ ∈ 15 + N ports CSI N 1 Config,..., 15 + 2 N ports CSI N 1 Config − 1 and i < N res CSI / 2 p ′ + N ports CSI N 1 Config i + 2 N 2 − N 2 Config for p ′ ∈ 15 + 2 N ports CSI N 1 Config,..., 15 + 3 N ports CSI N 1 Config − 1 and i < N res CSI / 2 p ′ + N ports CSI N 1 Config i + 3 N 2 − N 2 Config for p ′ ∈ 15 + 3 N ports CSI N 1 Config,..., 15 + N ports CSI − 1 and i < N res CSI / 2 p ′ + N ports CSI N 1 Config i + N res CSI / 2 for p ′ ∈ 15,..., 15 + N ports CSI N 1 Config − 1 and i ≥ N res CSI / 2 p ′ + N ports CSI N 1 Config i + N res CSI / 2 + N 2 − N 2 Config for p ′ ∈ 15 + N ports CSI N 1 Config,..., 15 + 2 N ports CSI N 1 Config − 1 and i ≥ N res CSI / 2 p ′ + N ports CSI N 1 Config i + N res CSI / 2 + 2 N 2 − N 2 Config for p ′ ∈ 15 + 2 N ports CSI N 1 Config,..., 15 + 3 N ports CSI N 1 Config − 1 and i ≥ N res CSI / 2 p ′ + N ports CSI N 1 Config i + N res CSI / 2 + 3 N 2 − N 2 Config for p ′ ∈ 15 + 3 N ports CSI N 1 Config,..., 15 + N ports CSI − 1 and i ≥ N res CSI / 2 transmitting CSI-RS configuration information including information on a component CSI-RS configuration to a terminal (103, 904, 905, 906, 1303, 1503); transmitting feedback configuration information to the terminal; transmitting the CSI-RS according to the CSI-RS configuration information; and receiving feedback information generated based on the CSI-RS received by the terminal, and wherein an aggregated CSI-RS antenna port index p for the CSI-RS is determined based on an index i of the component CSI-RS configuration, a total number (N res CSI) of component CSI-RS configurations which are aggregated, a number (N CSI ports) of antenna ports included in each component CSI-RS configuration, an antenna port index p' in each component CSI-RS configuration, a number (N 1) of at least one antenna port of a first direction and a number (N 2) of at least one antenna port of a second direction in an antenna array of the base station, and a number (N 1 Config) of at least one antenna port in the first direction and a number (N 2 Config) of at least one antenna port in the second direction of the component CSI-RS configuration, in case that a length of an orthogonal code is 4 and the number (N 2 Config) of at least one CSI-RS antenna port of the second direction in the component CSI-RS configuration is different from the number (N 2) of at least one antenna port of the second direction in the antenna array of the base station, wherein the aggregated CSI-RS antenna port index depends on a maximum number of CSI-RS antenna ports that the terminal is capable of recognizing, and wherein the aggregated CSI-RS antenna port index p is indexed in accordance with mathematical expression