An information processing system stores, for each application for carrying out a first sequence of processes using electronic data, application identification information and first-sequence information in a manner of associating them with one another; receives a request including the application identification information and electronic-data information; carries out the first sequence of processes on the electronic data according to the request; determines, before carrying out each process of the first sequence of processes, whether to generate second-sequence information where information concerning an additional process to be carried out before the process of the first sequence of processes is added, and if the determination result is to generate the second-sequence information, generates the second-sequence information and carries out a second sequence of processes where the additional process is carried out before the process of the first sequence of processes, on the electronic data.