To provide an information output unit for selecting subinformation to be output based on an attribute of main information to be output and to provide its program.

The information output unit comprises a selecting means for selecting main identification information indicating the attribute of main information, and the sub-information to be output based on sub-identification information indicating the attribute of the sub-information, and an information output means for outputting the sub-information selected by the selecting means together with the main information thereby. Its program is provided.