An information processing system comprising: a first management means with which a cloud system manages in association with each other cloud user authentication information for uniquely identifying a plurality of cloud users using a cloud service, local user authentication information for uniquely identifying a plurality of local users using a function of a multi-user device, and information about the function of the multi-user device that is executable using the local user authentication information; a second management means with which the multi-user device manages the cloud user authentication information and the local user authentication information in association with each other; a display generation means configured to display as a first display on a client device the information about the function of the multi-user device managed by the first management means and display as a second display on the client device the local user authentication information managed by the first management means in association with the information about the function of the multi-user device selected on the first display; an acceptance means configured to accept selection of the function of the multi-user device on the first display and selection of the local user authentication information on the second display (S5.8); a first transmission means with which the cloud system transmits to the multi-user device the local user authentication information managed by the first management means in association with the cloud user authentication information and an execution request for execution of the function of the multi-user device corresponding to the selection accepted by the acceptance means; an execution means with which the multi-user device executes the execution request transmitted by the first transmission means based on the local user authentication information; and a second transmission means with which the multi-user device transmits to the cloud system the cloud user authentication information managed by the second management means in association with the local user authentication information received together with the execution request from the cloud system and an execution result executed by the execution means. a first management means with which a cloud system manages in association with each other cloud user authentication information for uniquely identifying a plurality of cloud users using a cloud service, local user authentication information for uniquely identifying a plurality of local users using a function of a multi-user device, and information about the function of the multi-user device that is executable using the local user authentication information; a second management means with which the multi-user device manages the cloud user authentication information and the local user authentication information in association with each other; a display generation means configured to display as a first display on a client device the information about the function of the multi-user device managed by the first management means and display as a second display on the client device the local user authentication information managed by the first management means in association with the information about the function of the multi-user device selected on the first display; an acceptance means configured to accept selection of the function of the multi-user device on the first display and selection of the local user authentication information on the second display (S5.8); a first transmission means with which the cloud system transmits to the multi-user device the local user authentication information managed by the first management means in association with the cloud user authentication information and an execution request for execution of the function of the multi-user device corresponding to the selection accepted by the acceptance means; an execution means with which the multi-user device executes the execution request transmitted by the first transmission means based on the local user authentication information; and a second transmission means with which the multi-user device transmits to the cloud system the cloud user authentication information managed by the second management means in association with the local user authentication information received together with the execution request from the cloud system and an execution result executed by the execution means.