Provided are a content sharing system, a content sharing method, and a program, which are capable of appropriately processing an operation of a use on shared content after a display update by an operation of another user is performed. An object processing execution module executes the predetermined processing on an object that is in a focus state at a timing that is before a time earlier than the operation of instructing of execution of the predetermined processing by the predetermined time period and that is closest to the time earlier than the operation by the predetermined time period, when it is identified that the display update of the shared content has been performed by the operation of another user during as predetermined time period until the operation.