Disclosed is a method of operating a mobile terminal that is capable of interworking with a server, and the method includes: displaying a first user interface (UI) for managing a to-do list of a terminal user on a display unit; registering a task to be performed by the terminal user as a to-do item in the to-do list based on user information input through the first UI, and managing the plurality of to-do items registered in the to-do list; and when at least one of the plurality of to-do items is selected, performing an operation related to a task corresponding to the selected to-do item.