An electronic device (100, 104, 200a, 200b, 1301) comprising: a display (160, 560, 1360); a memory (130, 1330) storing instructions; and at least one processor (120, 1310) configured to execute the stored instructions to: implement a first content in a 3-dimensional, 3D, virtual space; and render an area corresponding to a field of view, FOV, of the first content being implemented in the 3D virtual space; CHARACTERISED IN THAT the at least one processor is further configured to execute the stored instructions to: store FOV information including information about a gaze distance from points where the eyes of the user are located to a display plane of the 3D virtual space, and a current location corresponding to the center point of an FOV corresponding to a gaze direction in the memory as metadata of the first content in response to a specified event; obtaining a reference point of the FOV from the FOV information stored as metadata; and generate, with respect to the reference point, a thumbnail of the first content corresponding to the area corresponding to the FOV or to a portion of the area corresponding to the FOV based on the metadata and a characteristic of an application executing the first content. a display (160, 560, 1360); a memory (130, 1330) storing instructions; and at least one processor (120, 1310) configured to execute the stored instructions to: implement a first content in a 3-dimensional, 3D, virtual space; and render an area corresponding to a field of view, FOV, of the first content being implemented in the 3D virtual space; implement a first content in a 3-dimensional, 3D, virtual space; and render an area corresponding to a field of view, FOV, of the first content being implemented in the 3D virtual space; CHARACTERISED IN THAT the at least one processor is further configured to execute the stored instructions to: store FOV information including information about a gaze distance from points where the eyes of the user are located to a display plane of the 3D virtual space, and a current location corresponding to the center point of an FOV corresponding to a gaze direction in the memory as metadata of the first content in response to a specified event; obtaining a reference point of the FOV from the FOV information stored as metadata; and generate, with respect to the reference point, a thumbnail of the first content corresponding to the area corresponding to the FOV or to a portion of the area corresponding to the FOV based on the metadata and a characteristic of an application executing the first content. store FOV information including information about a gaze distance from points where the eyes of the user are located to a display plane of the 3D virtual space, and a current location corresponding to the center point of an FOV corresponding to a gaze direction in the memory as metadata of the first content in response to a specified event; obtaining a reference point of the FOV from the FOV information stored as metadata; and generate, with respect to the reference point, a thumbnail of the first content corresponding to the area corresponding to the FOV or to a portion of the area corresponding to the FOV based on the metadata and a characteristic of an application executing the first content.