Question and answer method and device and vector database construction method and device

The invention provides a question and answer method and device and a vector database construction method and device.The question and answer method comprises the steps that to-be-inquired text content of a target user is obtained; performing vectorization operation on the to-be-inquired text content to obtain a first text vector; searching a pre-constructed vector database for a second text vector matched with the first text vector, wherein the vector database is constructed based on a vectorization operation result of the private data file; and determining a question and answer result for the target user based on the private text content pointed by the second text vector. The vector database is constructed based on the vectorization operation result of the private data file, so that the text content pointed by the second text vector searched from the vector database better meets special requirements of some private fields, and the accuracy and the response speed of the question and answer result are remarkabl