A method of searching media file applied on a DPF which includes: a memory, an input unit, a reading module, a determining module; and a displaying module. The method includes: obtaining the search table from the memory via the reading module, wherein the search table records relationships between the duration and a search manner; receiving an operation information of the input unit; determining a search manner according to the duration and the search table via the determining module; searching media files according to the determined search manner via the displaying module.