Patent ID: 7675541

Claim:
A first display apparatus connected to a second display apparatus, comprising: a display unit configured to display image data; a feature detection unit configured to detect a feature of input data which includes at least image data; a control unit configured to perform control such that an image included in the input data is displayed on at least one of the display unit and the second display apparatus according to the result of feature detection performed by the feature detection unit, wherein the feature detection unit detects a difference between frames or fields of image data included in the input data, as a feature of the input data; an authentication unit configured to perform authentication for authenticating the second display apparatus, wherein the control unit performs control such that one scene of image data included in the input data is displayed on the second display apparatus when the authentication is successfully performed; a plurality of input systems; an analysis unit configured to analyze the output of the feature detection unit; and a determination unit configured to determine the analysis result of the analysis unit, wherein the feature detection unit detects a feature amount of information serving as the input data input from a one predetermined input system among the plurality of input systems, at an interval of a predetermined period, wherein the analysis unit analyzes the fluctuation in time of the feature amount, wherein the determination unit determines whether the fluctuation in time of the feature amount satisfies a predetermined condition, and wherein the control unit displays an image in information input from the one predetermined input system, on the display unit when the fluctuation in time of the feature amount satisfies a predetermined condition.