A mobile device, comprising: a display unit configured to display content and different types of notifications (20a, 30a), including a simple notification providing only a fact of an occurrence of an event and a detail notification providing detail information of the occurrence of the event; a communication unit configured to transmit and receive a data; a camera unit configured to capture an image in front direction; and a processor configured to control the display unit, the communication unit, and the camera unit, wherein when the mobile device is paired with a head mounted display, HMD, and an event to which a notification (20a, 30a) to be provided occurs, the processor is further configured to: receive a location information from the HMD, wherein the location information indicates whether the mobile device is positioned at a first view angle area (ab) of the HMD, display the simple notification or the detail notification for an occurrence of the event in the mobile device when the mobile device is positioned at the first view angle area (ab) of the HMD, transmit a signal for providing the detail notification for the occurrence of the event to the HMD when the mobile device is positioned at a second view angle area (c) of the HMD, wherein the second view angle area (c) corresponds to an area outside of the first view angle area (ab). a display unit configured to display content and different types of notifications (20a, 30a), including a simple notification providing only a fact of an occurrence of an event and a detail notification providing detail information of the occurrence of the event; a communication unit configured to transmit and receive a data; a camera unit configured to capture an image in front direction; and a processor configured to control the display unit, the communication unit, and the camera unit, wherein when the mobile device is paired with a head mounted display, HMD, and an event to which a notification (20a, 30a) to be provided occurs, the processor is further configured to: receive a location information from the HMD, wherein the location information indicates whether the mobile device is positioned at a first view angle area (ab) of the HMD, display the simple notification or the detail notification for an occurrence of the event in the mobile device when the mobile device is positioned at the first view angle area (ab) of the HMD, transmit a signal for providing the detail notification for the occurrence of the event to the HMD when the mobile device is positioned at a second view angle area (c) of the HMD, wherein the second view angle area (c) corresponds to an area outside of the first view angle area (ab). receive a location information from the HMD, wherein the location information indicates whether the mobile device is positioned at a first view angle area (ab) of the HMD, display the simple notification or the detail notification for an occurrence of the event in the mobile device when the mobile device is positioned at the first view angle area (ab) of the HMD, transmit a signal for providing the detail notification for the occurrence of the event to the HMD when the mobile device is positioned at a second view angle area (c) of the HMD, wherein the second view angle area (c) corresponds to an area outside of the first view angle area (ab).