Abstract: A digital broadcast system includes a receiving device, one or more communication devices, and a broadcast station device. The receiving device includes a receiver for receiving a digitally broadcast program; a presentor for presenting the program received by the receiver to a viewer; and means for sending program ID information that specifies either the presented program or a program related to the presented program. Each of the communication devices receives the sent program ID information and sends communication device ID information to the broadcast station device together with the received program ID information. The broadcast station device receives the program ID information and the device ID information, and sends viewer targeted program specific service information to each of the communication devices identified by the received device ID information.

Abstract: A method number deciding unit 143 sets method numbers for methods in each class into the base method number table so that each method number within one class is different. A method table generating unit 144 generates a method table for each method, the method table including a pointer that is an offset form a first position of an executable program to an area where information relating to the method is stored, and additionally writes the generated method table at the first position of the class file. A method call instruction converting unit 145 replaces, when an instruction “invokevirtual” exists in a class file, a constant pool entry number written in an operand of the instruction with a method number, and deletes a constant pool entry indicated by the constant pool entry number.