An apparatus for inserting a plurality of event information tables (EITs) and a plurality of extended text tables (ETTs) into the data stream in a broadcast environment, the apparatus including a generator to set a first transmission interval for a group of EIT0s containing program information covering a first broadcast time, and a second tranmission interval for a group of EIT1s containing program information covering a second broadcast time after the first broadcast time, and to generate the group of EIT0s and the group of EIT1s. The first transmission interval for the group of EIT0s is set narrower than the second transmission interval for the group of EIT1s. The generator is further configured to set a transmission interval for a group of EIT3s containing program description associated with a group of EIT3s, and where the generator sets the transmission interval of the group of ETT3s to be greater than a sum of the first transmission interval for the group of EIT0s and the second transmission interval for the group of EIT1s.