A small-cell base station that is located in a macro cell of a macro-cell base station and configured to synchronously transmit data to a communication terminal apparatus by matching timing with the macro-cell base station, the small-cell base station comprising: a radio transceiving section connected with an antenna; a radio communication control section; a transmission cable connecting the radio transceiving section and the radio communication control section; and a downlink signal receiving section configured to receive downlink signals transmitted from the macro-cell base station and an own base station respectively, and wherein the small-cell base station is configured to: measure a reception-timing difference between the downlink signals transmitted from the macro-cell base station and the own base station based on a reception result of the downlink signals, adjust a transmission timing of the downlink signal of the own base station based on the reception-timing difference, and transmit the downlink signal at the adjusted transmission timing, wherein the downlink signal receiving section (25 is configured to: measure a reception-timing difference between the downlink signals transmitted from the macro-cell base station and the own base station based on the reception result of the downlink signals; and transmit information on the reception-timing difference to the radio communication control section of the own base station, and wherein the radio communication control section is configured to: receive the information of the reception-timing difference from the downlink signal receiving section of the own base station, calculate an offset value of the transmission timing of the downlink signal of the own base station based on the reception-timing difference; adjust the transmission timing of the downlink signal of the own base station based on the offset value; and control to transmit the downlink signal at the adjusted transmission timing, characterized in that the small-cell base station is configured to calculate the offset value of the transmission timing of the downlink signal of the own base station based on the reception-timing difference and a cell radius of the own base station. a radio transceiving section connected with an antenna; a radio communication control section; a transmission cable connecting the radio transceiving section and the radio communication control section; and a downlink signal receiving section configured to receive downlink signals transmitted from the macro-cell base station and an own base station respectively, and wherein the small-cell base station is configured to: measure a reception-timing difference between the downlink signals transmitted from the macro-cell base station and the own base station based on a reception result of the downlink signals, adjust a transmission timing of the downlink signal of the own base station based on the reception-timing difference, and transmit the downlink signal at the adjusted transmission timing, wherein the downlink signal receiving section (25 is configured to: measure a reception-timing difference between the downlink signals transmitted from the macro-cell base station and the own base station based on the reception result of the downlink signals; and transmit information on the reception-timing difference to the radio communication control section of the own base station, and wherein the radio communication control section is configured to: receive the information of the reception-timing difference from the downlink signal receiving section of the own base station, calculate an offset value of the transmission timing of the downlink signal of the own base station based on the reception-timing difference; adjust the transmission timing of the downlink signal of the own base station based on the offset value; and control to transmit the downlink signal at the adjusted transmission timing, characterized in that the small-cell base station is configured to calculate the offset value of the transmission timing of the downlink signal of the own base station based on the reception-timing difference and a cell radius of the own base station.