A wireless base station comprising: a connection request signal generation unit configured to transmit a connection request signal to a selected neighboring base station selected from neighboring base stations existing around; a common channel reception processing unit configured to: when receiving a response signal which corresponds to the connection request signal, from the selected neighboring base station, store a value of transmission power with which the connection request signal is transmitted most recently, as a response time transmission power, in correspondence to the selected neighboring base station; determine a minimum response transmission power of which value is the smallest among at least one response-time transmission power after storing the at least one response-time transmission power for the neighboring base stations; and calculate a transmission power of a common channel with which the own station should transmit, based on the minimum response transmission power; and an ordinary processing unit configured to perform a transmission through a common channel by using the common channel transmission power, wherein the common channel reception processing unit is configured to: when not receiving the response signal to the connection request signal from the selected neighboring base station, instruct the connection request signal generation unit to retransmit the connection request signal at a transmission power at a higher value than the connection request signal which is transmitted at a last time by a predetermined value; and when not receiving the response signal from the selected neighboring base station even when transmitting the connection request signal by setting the transmission power at a maximum value, store the maximum value of the transmission power as the response time transmission power, in correspondence to the selected neighboring base station. a connection request signal generation unit configured to transmit a connection request signal to a selected neighboring base station selected from neighboring base stations existing around; a common channel reception processing unit configured to: when receiving a response signal which corresponds to the connection request signal, from the selected neighboring base station, store a value of transmission power with which the connection request signal is transmitted most recently, as a response time transmission power, in correspondence to the selected neighboring base station; determine a minimum response transmission power of which value is the smallest among at least one response-time transmission power after storing the at least one response-time transmission power for the neighboring base stations; and calculate a transmission power of a common channel with which the own station should transmit, based on the minimum response transmission power; and an ordinary processing unit configured to perform a transmission through a common channel by using the common channel transmission power, wherein the common channel reception processing unit is configured to: when not receiving the response signal to the connection request signal from the selected neighboring base station, instruct the connection request signal generation unit to retransmit the connection request signal at a transmission power at a higher value than the connection request signal which is transmitted at a last time by a predetermined value; and when not receiving the response signal from the selected neighboring base station even when transmitting the connection request signal by setting the transmission power at a maximum value, store the maximum value of the transmission power as the response time transmission power, in correspondence to the selected neighboring base station.