An advance notification system, an advance notification method, and a mobile communication device are disclosed. In one embodiment, an advance notification system comprises a first mobile device and a second mobile device. The first mobile device stores a schedule including a scheduled time and a scheduled place and comprises a transmitter and at least one first processor. The second mobile device acquires a device position of the second mobile device itself. The at least one processor determines whether an advance notification is required on the basis of the device position and the scheduled place. The at least one processor also causes the transmitter to transmit the advance notification to the second mobile device when determining that the advance notification is required.