  The development and spread of information and communication technologies have
increased and diversified information. However, the increase in the volume and
the selection of information does not necessarily promote understanding. In
addition, conventional evaluations of information transfer have focused only on
the arrival of information to the receivers. They need to sufficiently take
into account the receivers' understanding of the information after it has been
acquired, which is the original purpose of the evaluation. In this study, we
propose the concept of "information digestion," which refers to the receivers'
correct understanding of the acquired information, its contents, and its
purpose. In the experiment, we proposed an evaluation model of information
digestibility using hierarchical factor analysis and extracted factors that
constitute digestibility by four types of media.
