Patent ID: 7139626

Claim:
A main device which is used in a state of being fixedly or semi-fixedly installed and which is used to transfer any received program data to an easy-to-carry portable device, said main device comprising: receiving means for receiving program data provided through broadcasting; demultiplexing means for demultiplexing the program data received by said receiving means into program components, each program component representing data of a multimedia type and spanning a same play-back length as the program data; primary storing means for storing the program components constituting the program data received by said receiving means; transfer priority assigning means for assigning a transfer priority and class to each program component constituting the program data stored in said primary storing means; transfer priority defining means for previously defining default transfer priorities to each type of the program components; and transferring means for discretely transferring, to the portable device, each of the program components of the program data stored in said primary storing means in the direction of a time axis in order of the transfer priority assigned by said transfer priority means to each program component of the program data stored in said primary storing means, wherein: said transfer priority assigning means assigns the default transfer priorities to each of the program components in accordance with a definition provided by said transfer priority defining means; said transfer priority defining means classifies the class of each program component; program components of the program data which are replaceable with each other during playing-back are assigned in a same class; and when no program component in the same class has a value that is defined as being top transfer priority therein, said transfer priority assigning means changes a value of a program component which is currently assigned the highest transfer priority in the class to the value that is defined as being the top transfer priority therein.