An apparatus of processing a digital service signals and a method thereof are disclosed. The present invention includes a PDI module configured to receive a PDI table, wherein the PDI table includes at least one question element having attributes of a PDI question, wherein the PDI table further includes a table Id field identifying the PDI table, a table version field indicating a version of the PDI table and a time field indicating a date and a time of the most recent change to the PDI question and extract the PDI question from the at least one question element, wherein each of the at least one question element has a different type, a PDI answer module configured to receive a PDI answer according to the extracted PDI question, a filtering module configured to receive a filtering criteria information and filter contents of the digital service signal by comparing the filtering criteria information against the received the PDI answer and a content storing module configured to download the filtered contents, wherein the type of the at least one question element indicates a type for the PDI question with one of an integer answer, a Boolean answer, a selection answer, a text answer and an answer with no PDI question.