A display control apparatus connectable to a plurality of input devices, receiving an input of a video signal from one of the plurality of input devices, and making a control that causes a video to be displayed on a display apparatus, the display control apparatus comprising: a capturing unit configured to capture image data that represents a frame image of the input video signal; and a signal detector configured to detect whether the video signal is input, and issue an instruction to cause the display apparatus to display the video or the frame image on the basis of a result of the detection; characterized in that: said display control apparatus further comprises a video capture device driver configured to control the capturing unit which comprises a display port and a VGA port; the signal detector is further configured to: inquire each of the display port and VGA port whether a video signal is input to each port (300,310) by utilizing a register access function of the video capture device driver, determine whether an input video signal is present, wherein a flag indicating a connection status where a video signal is input is set for each of the ports (300, 310) at fixed time intervals, compare the connection status of each port (300, 310) with a respective connection status set to the flag of the respective port (300, 310), check the time stamp of each port (300, 310) when the connection status has been changed, temporally store the frame image captured by the capturing unit, and cause the display control apparatus to further generate the frame image from the image data captured by the capturing unit most recently to cause the display apparatus to display the generated frame image when the video signal is disconnected and to instruct the display apparatus to display the frame image, wherein the most recently captured frame image corresponds to a frame image which has been captured at a time indicated by the time stamp. a capturing unit configured to capture image data that represents a frame image of the input video signal; and a signal detector configured to detect whether the video signal is input, and issue an instruction to cause the display apparatus to display the video or the frame image on the basis of a result of the detection; said display control apparatus further comprises a video capture device driver configured to control the capturing unit which comprises a display port and a VGA port; the signal detector is further configured to: inquire each of the display port and VGA port whether a video signal is input to each port (300,310) by utilizing a register access function of the video capture device driver, determine whether an input video signal is present, wherein a flag indicating a connection status where a video signal is input is set for each of the ports (300, 310) at fixed time intervals, compare the connection status of each port (300, 310) with a respective connection status set to the flag of the respective port (300, 310), check the time stamp of each port (300, 310) when the connection status has been changed, temporally store the frame image captured by the capturing unit, and cause the display control apparatus to further generate the frame image from the image data captured by the capturing unit most recently to cause the display apparatus to display the generated frame image when the video signal is disconnected and to instruct the display apparatus to display the frame image, wherein the most recently captured frame image corresponds to a frame image which has been captured at a time indicated by the time stamp. inquire each of the display port and VGA port whether a video signal is input to each port (300,310) by utilizing a register access function of the video capture device driver, determine whether an input video signal is present, wherein a flag indicating a connection status where a video signal is input is set for each of the ports (300, 310) at fixed time intervals, compare the connection status of each port (300, 310) with a respective connection status set to the flag of the respective port (300, 310), check the time stamp of each port (300, 310) when the connection status has been changed, temporally store the frame image captured by the capturing unit, and cause the display control apparatus to further generate the frame image from the image data captured by the capturing unit most recently to cause the display apparatus to display the generated frame image when the video signal is disconnected and to instruct the display apparatus to display the frame image, wherein the most recently captured frame image corresponds to a frame image which has been captured at a time indicated by the time stamp.