Patent ID: 8311400

Claim:
A content reproduction apparatus connected to a display and speakers, said content reproduction apparatus comprising: a content display control unit configured to cause the display to display a first window for displaying video of first content to a first viewer and a second window for displaying video of second content to a second viewer; a sound output control unit configured to cause, among the speakers, at least one speaker assigned to the first content to output sound of the first content, and to cause, among the speakers, at least one speaker assigned to the second content to output sound of the second content; a viewable range calculation unit configured to calculate a viewable range, using (i) information indicating a size of a predetermined range, (ii) the number and a position of the at least one speaker assigned to the first content, and (iii) the number of channels required for a predetermined acoustic effect, the viewable range being included in the predetermined range and being a range in which the first viewer can hear the sound of the first content with the predetermined acoustic effect included in at least one acoustic effect that is obtained from the first content and is available for reproducing the first content; and a presentation control unit configured to output information that is based on the viewable range calculated by said viewable range calculation unit, so as to present the information to the first viewer.