5. A text input device, comprising: at least one processor; a non-transitory storage system coupled to the at least one processor and configured to store one or more programs configured to be executed by the at least one processor, the one or more programs comprise instructions for: displaying a virtual keyboard on a display device connecting to a set-top box; receiving a first input instruction from a remote controller; decoding the first input instruction and inputting a first character via a first virtual key of the virtual keyboard on the display device according to the first input instruction; performing a text searching operation to a text library according to the first character; displaying candidate characters on the virtual keyboard according to the search result; detecting a movement track of the remote controller; calculating a movement speed V 1 of a focus point of the remote controller on the virtual keyboard; determining whether the movement speed V 1 of the focus point is greater than a preset speed V; when the movement speed V 1 is greater than the preset speed V, moving the focus point from the first virtual key corresponding to the first character to a second virtual key corresponding to a second character from the candidate characters wherein a distance between the first virtual key and the second virtual key is not greater than a preset distance d; and inputting the second character on which the focus point is located via the second virtual key.
5. A text input device, comprising: at least one processor; a non-transitory storage system coupled to the at least one processor and configured to store one or more programs configured to be executed by the at least one processor, the one or more programs comprise instructions for: displaying a virtual keyboard on a display device connecting to a set-top box; receiving a first input instruction from a remote controller; decoding the first input instruction and inputting a first character via a first virtual key of the virtual keyboard on the display device according to the first input instruction; performing a text searching operation to a text library according to the first character; displaying candidate characters on the virtual keyboard according to the search result; detecting a movement track of the remote controller; calculating a movement speed V 1 of a focus point of the remote controller on the virtual keyboard; determining whether the movement speed V 1 of the focus point is greater than a preset speed V; when the movement speed V 1 is greater than the preset speed V, moving the focus point from the first virtual key corresponding to the first character to a second virtual key corresponding to a second character from the candidate characters wherein a distance between the first virtual key and the second virtual key is not greater than a preset distance d; and inputting the second character on which the focus point is located via the second virtual key. 6. The text input device as claimed in claim 5 , wherein the one or more programs further comprise instructions for: generating separate candidate characters associated with the first character by searching the text library according to use frequency of texts.