A method for a communication apparatus to align a frame boundary with a cell is provided, wherein the communication apparatus comprises a wireless radio frequency signal processing module used for processing a plurality of wireless signals received by the cell, and transforming the plurality of wireless signals into a plurality of base frequency signals; a base frequency signal processing module used for synchronizing the timing sequence of a local time reference with the timing sequence of the cell, and then processing the plurality of base frequency signals according to the local time reference; wherein the base frequency signal processing module is used to capture a preset synchronizing signal from the plurality of base frequency signals and adjusting the timing sequence of the local time reference according to the preset synchronizing signal to align the frame boundary of the local time reference at the frame boundary of the cell, and the preset synchronizing signal is a primary preset synchronizing signal or a secondary preset synchronizing signal. The communication apparatus provided by the present invention enables the boundary alignment efficiency and accuracy to be improved, thereby reducing the interference generated by a time reference error.