In this paper, we propose a transmission method of the synchronized streaming data in digital broadcasting environment. The ancillary data that is used in the data broadcasting can be classified into three types: asynchronous, synchronous, and synchronized data. While the transmission of the asynchronous data is very simple, that of the synchronous or synchronized data is more complex because the synchronous and the synchronized data have time information for the presentation. Inaccurate transmission time without regarding the presentation time for the synchronous or synchronized data can cause a buffer overflow or delayed reception of a data in the receiver. Therefore, we propose a method to calculate the accurate transmission time of the synchronized data by using the MPEG-2 Program Clock Reference (PCR) and the Presentation Time Stamp (PTS) of the synchronized data. To verify the proposed method, we make an MPEG-2 Transport Stream (TS) by multiplexing the synchronized data with an A/V program based on the proposed method, and then analyze the multiplexed MPEG-2 TS. Also, the screen shots of the displayed synchronized data are presented in the receiver.