An information processing device of the present disclosure is used in a mounting system including multiple mounting-related devices each having a display section that visually notifies an operator of information and an attachment portion to which a member is attached and related to a process of mounting a component on a processing target object, and a moving work device that is moved between the multiple mounting-related devices to automatically attach and detach the member to and from the attachment portion. The information processing device includes a control section that outputs, to the display section, notification information including work details that are substitutable by the operator in association with a status of the moving work device based on a predetermined priority order based on continuation of processes of the mounting-related devices.