An information processing system includes an apparatus and terminal devices, wherein a first terminal device of the terminal devices includes a first acquisition unit acquiring a file name of one file stored in the apparatus using first user information, a first send unit sending a message including the first user information and access information and directed to the second user, wherein a second terminal device of the terminal devices includes a receiving unit receiving the message from the another apparatus based on second user information, a second acquisition unit acquiring one file specified by the access information using the first user information, wherein the apparatus includes a determination unit determining whether one file is sent to the second terminal device based on the first user information and information of the user who can access one file, and a second send unit sending one file to the second terminal device.