Method and system for supporting random access of mpeg data

A method for supporting random access of MPEG data comprises the steps of: obtaining at least one access unit including media data, which is coded through a process including capsulation and packetization; generating at least one media processing unit (MPU) by grouping the at least one access unit; determining an initialization flag which indicates whether the at least one access unit in the at least one MPU includes all data required for initializing a decoding process; and inserting the initialization flag into at least one header of the MPU.