An information processing system includes circuitry that acquires input information input to a terminal apparatus, the terminal apparatus operating a message exchange program, determines, based on the input information being acquired, whether or not a condition as a trigger for calling an information processing service is satisfied, changes, based on the determination that the condition as the trigger for calling the information processing service is satisfied, a status of the message exchange program into a status that exchanges a message with the information processing service, acquires, based on the message to the information processing service, electronic information used for information processing, and requests an information apparatus to execute the information processing using the electronic information being acquired.