A base station apparatus is obtained that reduces, by a software process, delay time occurring in a call connection procedure. A base station apparatus 1 that performs radio communication with a mobile phone terminal 8 includes a radio resource managing unit 4 that manages a radio resource used for the radio communication; and a call connection processing unit 5. The call connection processing unit 5 is provided as a functional block independent of the radio resource managing unit 4 and performs a call connection process for the mobile phone terminal 8.