An apparatus detects, from symbol data of a predetermined communication scheme that is input via a common public radio interface (CPRI) at a first rate indicating a chip rate for the CPRI, a timing at which a clock phase matches between the first rate and a second rate indicating a symbol rate for the predetermined communication scheme, where the CPRI is an internal interface for a radio communication apparatus. The apparatus changes, at the timing, a clock rate for transmitting the symbol data, from the first rate to the second rate.