[Object] To prevent a deformation of an image based on a gesture from becoming excessive due to a processing delay.
[Solution] A computer (1) that is a remote computer sequentially detects the position of an indicator on a sensor surface at a predetermined sampling rate with the use of the input sensor, and sequentially transmits report data including the detected position to a host computer each time the position of the indicator is detected. A computer (2) that is the host computer detects a gesture on the basis of a series of pieces of report data received from the computer (1), generates a deformed image by imparting a deformation corresponding to the contents and amount that are indicated by the detected gesture, to the image, transmits the deformed image to the computer (1), and executes cancelling processing to cancel the deformation when the report data received from the computer (1) is an end report indicating that the indicator has been moved away from the sensor surface.