A display device configured to be connected to an information terminal, the display device comprising: a video reception unit (10, 16) configured to receive video information about a screen image including a cursor from the information terminal; a touch panel (11, 12) configured to bring up the screen image on its display based on the video information received by the video reception unit (10, 16) and to detect a touch position specified by one of a plurality of touch operations by a user and a transmission unit (10, 15) configured to transmit operation information corresponding to the touch operation to the information terminal, wherein the plurality of touch operations are performed continuously within a predetermined interval time based on interval time information related to the information terminal, wherein the transmission unit (10, 15) is configured to transmit to the information terminal a) when the touch position is specified by the touch operation, first operation information for displacing the cursor from a predetermined reference position to the touch position, b) when specifying of the touch position is cancelled, when the user performs a release operation for disengaging the finger from the display to terminate the touch operation, after the first operation information is transmitted, second operation information for returning the cursor from the touch position to the predetermined reference position, and c) when a next touch operation of the plurality of touch operations is performed within the predetermined interval time after the second operation information is transmitted, an operation information for a next session after the predetermined interval time elapses, wherein the operation information for the next session is information for displacing the cursor from the predetermined reference position to the touch position of the next touch operation. a video reception unit (10, 16) configured to receive video information about a screen image including a cursor from the information terminal; a touch panel (11, 12) configured to bring up the screen image on its display based on the video information received by the video reception unit (10, 16) and to detect a touch position specified by one of a plurality of touch operations by a user and a transmission unit (10, 15) configured to transmit operation information corresponding to the touch operation to the information terminal, wherein the plurality of touch operations are performed continuously within a predetermined interval time based on interval time information related to the information terminal, wherein the transmission unit (10, 15) is configured to transmit to the information terminal a) when the touch position is specified by the touch operation, first operation information for displacing the cursor from a predetermined reference position to the touch position, b) when specifying of the touch position is cancelled, when the user performs a release operation for disengaging the finger from the display to terminate the touch operation, after the first operation information is transmitted, second operation information for returning the cursor from the touch position to the predetermined reference position, and c) when a next touch operation of the plurality of touch operations is performed within the predetermined interval time after the second operation information is transmitted, an operation information for a next session after the predetermined interval time elapses, a) when the touch position is specified by the touch operation, first operation information for displacing the cursor from a predetermined reference position to the touch position, b) when specifying of the touch position is cancelled, when the user performs a release operation for disengaging the finger from the display to terminate the touch operation, after the first operation information is transmitted, second operation information for returning the cursor from the touch position to the predetermined reference position, and c) when a next touch operation of the plurality of touch operations is performed within the predetermined interval time after the second operation information is transmitted, an operation information for a next session after the predetermined interval time elapses, wherein the operation information for the next session is information for displacing the cursor from the predetermined reference position to the touch position of the next touch operation.