An information processing system includes a processor and a memory that stores a plurality of instructions which cause the processors to control executing a first application executed on an operation unit including a display, acquire identification information for identifying the first application in accordance with execution of the first application, register the identification information being acquired in the memory, control executing a second application executed on a main unit controlling the information processing system to perform multiple functions according to an instruction input to the operation unit, output, in response to receiving a request to log out while the second application is executing, rejection information indicating that the request to log out is rejected, and control, in response to outputting the rejection information, the display of the operation unit to display first name information indicating a name of the first application corresponding to the identification information registered in the memory.