An electronic system, comprising: a portable display device of a user A, comprising: a first display unit for displaying images of scenes according to a field of view, FOV, of the user A; a storage unit for storing the images of scenes; a control unit for generating information of a current viewing area of one of the images of scenes according to the FOV of the user A as displayed on the first display unit; whereby the images of scenes are greater than the current viewing area; and a first communication unit for transmitting the generated information of the current viewing area to a guiding device of a user B, the guiding device comprising: a storage unit for storing the same images of scenes; a second communication unit for receiving the generated information of the current viewing area of one of the images of scenes according to the FOV of the user A from the portable display device; a second display unit for displaying, for the user B, one of the images of scenes according to the FOV of the user A as a first viewing area, wherein the first viewing area is greater than the current viewing area of one of the images of scenes according to the FOV of the user A as displayed on the first display unit; a processing unit for creating a highlight indicator, wherein the highlight indicator represents the current viewing area of the user A; wherein the processing unit is configured for generating guidance information associated with a guidance task according to the generated information of the current viewing area; wherein the second communication unit is configured to transmit the guidance information to the first communication unit, and accordingly the control unit performs the guidance task according to the guidance information. a portable display device of a user A, comprising: a first display unit for displaying images of scenes according to a field of view, FOV, of the user A; a storage unit for storing the images of scenes; a control unit for generating information of a current viewing area of one of the images of scenes according to the FOV of the user A as displayed on the first display unit; whereby the images of scenes are greater than the current viewing area; and a first communication unit for transmitting the generated information of the current viewing area to a guiding device of a user B, a control unit for generating information of a current viewing area of one of the images of scenes according to the FOV of the user A as displayed on the first display unit; whereby the images of scenes are greater than the current viewing area; and a first communication unit for transmitting the generated information of the current viewing area to a guiding device of a user B, the guiding device comprising: a storage unit for storing the same images of scenes; a second communication unit for receiving the generated information of the current viewing area of one of the images of scenes according to the FOV of the user A from the portable display device; a second display unit for displaying, for the user B, one of the images of scenes according to the FOV of the user A as a first viewing area, wherein the first viewing area is greater than the current viewing area of one of the images of scenes according to the FOV of the user A as displayed on the first display unit; a processing unit for creating a highlight indicator, wherein the highlight indicator represents the current viewing area of the user A; wherein the processing unit is configured for generating guidance information associated with a guidance task according to the generated information of the current viewing area; wherein the second communication unit is configured to transmit the guidance information to the first communication unit, and accordingly the control unit performs the guidance task according to the guidance information. a storage unit for storing the same images of scenes; a second communication unit for receiving the generated information of the current viewing area of one of the images of scenes according to the FOV of the user A from the portable display device; a second display unit for displaying, for the user B, one of the images of scenes according to the FOV of the user A as a first viewing area, wherein the first viewing area is greater than the current viewing area of one of the images of scenes according to the FOV of the user A as displayed on the first display unit; a processing unit for creating a highlight indicator, wherein the highlight indicator represents the current viewing area of the user A; a second communication unit for receiving the generated information of the current viewing area of one of the images of scenes according to the FOV of the user A from the portable display device; a second display unit for displaying, for the user B, one of the images of scenes according to the FOV of the user A as a first viewing area, wherein the first viewing area is greater than the current viewing area of one of the images of scenes according to the FOV of the user A as displayed on the first display unit; a processing unit for creating a highlight indicator, wherein the highlight indicator represents the current viewing area of the user A; wherein the processing unit is configured for generating guidance information associated with a guidance task according to the generated information of the current viewing area; wherein the second communication unit is configured to transmit the guidance information to the first communication unit, and accordingly the control unit performs the guidance task according to the guidance information.