A radio communication system operating in a coordinated multiple-point transmission/reception, CoMP, technique and comprising a plurality of radio base station apparatuses (20A, 20B) and a user terminal (10A, 10B) that is configured to communicate with the plurality of radio base station apparatuses (20A, 20B), wherein: the radio base station apparatuses (20A, 20B) comprise: a transmission section (201A, 201B) configured to transmit a reference signal for channel state measurement to the user terminal (10A, 10B); and a receiving section (201A, 201B) configured to receive channel state information generated in the user terminal (10A, 10B) based on the reference signal; and the user terminal (10A, 10B) comprises: a reception section configured to receive the reference signal: a channel state information generating section (1107, 1108) configured to generate a plurality of pieces of channel state information based on the reference signal; and a transmission section configured to transmit the plurality of pieces of channel state information to the one or more radio base station apparatus (20A, 20B), characterized by that the channel state information generating section generates one of the plurality of pieces of channel state information, that is represented by a ratio of a received signal component from a serving cell and a received signal component from a coordinated cell, when the plurality of radio base station apparatuses (20A, 20B) coordinate and perform transmission. the radio base station apparatuses (20A, 20B) comprise: a transmission section (201A, 201B) configured to transmit a reference signal for channel state measurement to the user terminal (10A, 10B); and a receiving section (201A, 201B) configured to receive channel state information generated in the user terminal (10A, 10B) based on the reference signal; and the user terminal (10A, 10B) comprises: a reception section configured to receive the reference signal: a channel state information generating section (1107, 1108) configured to generate a plurality of pieces of channel state information based on the reference signal; and a transmission section configured to transmit the plurality of pieces of channel state information to the one or more radio base station apparatus (20A, 20B), characterized by that the channel state information generating section generates one of the plurality of pieces of channel state information, that is represented by a ratio of a received signal component from a serving cell and a received signal component from a coordinated cell, when the plurality of radio base station apparatuses (20A, 20B) coordinate and perform transmission. a transmission section (201A, 201B) configured to transmit a reference signal for channel state measurement to the user terminal (10A, 10B); and a receiving section (201A, 201B) configured to receive channel state information generated in the user terminal (10A, 10B) based on the reference signal; and the user terminal (10A, 10B) comprises: a reception section configured to receive the reference signal: a channel state information generating section (1107, 1108) configured to generate a plurality of pieces of channel state information based on the reference signal; and a transmission section configured to transmit the plurality of pieces of channel state information to the one or more radio base station apparatus (20A, 20B), characterized by that the channel state information generating section generates one of the plurality of pieces of channel state information, that is represented by a ratio of a received signal component from a serving cell and a received signal component from a coordinated cell, when the plurality of radio base station apparatuses (20A, 20B) coordinate and perform transmission. a reception section configured to receive the reference signal: a channel state information generating section (1107, 1108) configured to generate a plurality of pieces of channel state information based on the reference signal; and a transmission section configured to transmit the plurality of pieces of channel state information to the one or more radio base station apparatus (20A, 20B), characterized by that the channel state information generating section generates one of the plurality of pieces of channel state information, that is represented by a ratio of a received signal component from a serving cell and a received signal component from a coordinated cell, when the plurality of radio base station apparatuses (20A, 20B) coordinate and perform transmission. a channel state information generating section (1107, 1108) configured to generate a plurality of pieces of channel state information based on the reference signal; and a transmission section configured to transmit the plurality of pieces of channel state information to the one or more radio base station apparatus (20A, 20B), characterized by that the channel state information generating section generates one of the plurality of pieces of channel state information, that is represented by a ratio of a received signal component from a serving cell and a received signal component from a coordinated cell, when the plurality of radio base station apparatuses (20A, 20B) coordinate and perform transmission.