Terminal software online upgrading method and device

The invention discloses a terminal software online upgrading method and device, and the method comprises the steps: dynamically updating the parallelism degree of a server side at the server side according to the self-load performance, and initiating a server side parallelism degree request to the server side according to the set terminal parallelism degree allowed by the self-load performance when the terminal finds that upgrading is needed, the method comprises the following steps: acquiring a server parallelism degree returned by a server, selecting a smaller one of a terminal parallelism degree allowed by the load performance of a terminal and the server parallelism degree as a file downloading parallelism degree, and starting a thread to initiate a parallel file downloading request to the server by taking the file downloading parallelism degree as a thread number of parallel downloading to finish software upgrading. According to the invention, the load performance of the server and the load performance o