1. A hotspot analysis system, comprising: a database comprising a plurality of records, each comprising context information having at least time information and position information; a filtering module filtering the records according to current context information to obtain a plurality of filtered records, wherein the current context information comprises current time information; a clustering module clustering the filtered records into at least one hotspot cluster according to the position information of the filtered records, and generating a hotspot area for each hotspot cluster; and an analysis module calculating integral hotness for each hotspot cluster according to the number of the filtered records in the hotspot cluster and the size of the hotspot area of the hotspot cluster, and generating at least hotspot area information according to the integral hotness and the hotspot area of each hotspot cluster.