1. An information-processing system comprising: at least one processor; an input device configured to acquire items of posting information posted in connection with an application, and a memory; the at least one processor configured to: display the items of posting information acquired by the input device on a display; at least a first item of the displayed items of posting information including conditional additional information for starting execution of the application, and at least a second item of the displayed items of posting information not including conditional additional information for starting execution of the application; and at least an object to input a user's instruction of executing the application in a vicinity of at least the first item of the displayed items of posting information; and start and execute, in response to selection of the object by the user, while the items of posting information are displayed on the display, the application using the conditional additional information of the first item of the displayed items of posting information corresponding to the selected object.