A task performing method, system, and computer readable recording medium for easily performing a task that corresponds to an event created in a device or in an external device connected to the device are provided. The method includes displaying a user interface screen on the device, the user interface screen including at least one piece of card interface information based on an event created in at least one external device connected to the device or created in the device; and performing a task in the device that corresponds to an input signal based on the displayed user interface screen including the at least one piece of card interface information.