An information processing system includes a memory and processors. The memory stores flow information and flow-identification information for each process sequence performed by using electronic data. The flow information defines program-identification information identifying programs for executing the process sequence, and an execution order of the programs. The processors execute computer-executable instructions stored in the memory to execute a process including accepting a request including information relating to the electronic data and the flow-identification information, from a device coupled to the system; acquiring the flow information associated with the flow-identification information included in the request, from the memory; and executing the process sequence using the electronic data based on the information relating to the electronic data, by executing the programs identified by the program-identification information defined in the acquired flow information, in the execution order. When the process sequence includes branching, the processes are branched according to a branch condition.