1. A communication support system comprising: a network interface configured to receive, via a network, a captured image obtained in another location; a display configured to display the captured image received by the network interface; a cropping unit configured, in a case when the display displays a reference image superposed as an upper layer over the captured image, to crop an image of an area having the reference image arranged therein out of the captured image; a specifying unit configured to specify a person area corresponding to a person within a cropped image obtained by the cropping unit; and a processing unit configured to make an area that is different from the person area specified by the specifying unit transparent in the cropped image, wherein the display displays an output image obtained by superposing the reference image as an upper layer over the captured image and further superposing the cropped image processed by the processing unit as an upper layer over the reference image, wherein at least one of the cropping unit, the specifying unit and the processing unit is implemented by a processor or a circuit.