A data scheduling module, a data scheduling method and computer program product thereof for a wireless communication apparatus are provided. The data scheduling method comprises the following steps: determining that the frame length of a second data transmission interval is not smaller than a frame length of a first data transmission interval; summing at least one first data and at least one second data according to the frame length of the second data transmission interval; calculating an average value according to the frame length of the second data transmission interval and the summed result; calculating an aggregate data transmission interval according to a data transmission capacity, the average value, and an integer adjusting value; and transmitting the at least one first data and the at least one second data via a plurality of frames in accordance with the aggregate data transmission interval.