Abstract: A method and apparatus enables presentation of complementary data associated with output data presented in an electronic apparatus. The method includes presenting the output data via an output device of the electronic apparatus, obtaining event data associated with the presented output data and based on which the complementary data is obtainable, and submitting the event data to a data presentation unit external to the electronic apparatus. A method and data presentation unit is also provided for presenting complementary data in the data presentation unit. The method includes receiving, from an electronic apparatus located externally to the data presentation unit, event data associated with output data presented in the electronic apparatus. The method also includes obtaining complementary data associated with the output data based on the event data, and presenting the obtained complementary data.