An apparatus comprising a memory storing instructions is provided. The apparatus includes a control unit for executing the instructions to send signals to display, for a user, a first virtual image superimposed onto a representation of real space. The control unit further executes instructions to send signals to identify a potential source of interest for the user, the potential source of interest being outside of a user focus area in the representation of real space. The control unit further executes instructions to send signals to notify the user of the potential source of interest.