To provide a data broadcast transmitter/receiver having a high processing speed and capable of suppressing the fragmentation of a region area in a data storage area.

A RAM 142 has a data storage area for storing digital data extracted by TS decoders 104.1, 104.2. The data storage area includes a partition area to which buffer areas respectively corresponding to prescribed fixed data lengths are allocated in accordance with an allocation request and a region area to which segment areas corresponding to data lengths to be stored are allocated in accordance with the allocation request. An arithmetic processing part 144 determines which stores data, the partition area or the region area in accordance with the data length of the digital data and generates the allocation request.