Design support system facilitating process modification

In order to provide a design support system for facilitating determination of an efficient operation to thereby improve operability, a CPU (11) presents a list including processes selected from process history data, that satisfy a predetermined condition, receives a command designating a process for modification from the list, which serves as a modification candidate process, specifies a process that requires adjustment as a result of the modification applied to the modification candidate process, specifies a procedure for the adjustment, prepares a list including a process specified as requiring adjustment and data on adjustment procedure image according to the procedure for the adjustment specified, and causes a display control section (14) to display the list and the data.