1. A content data processing method comprising: downloading, by a communication section, the content data from a distribution server; storing the downloaded content data in a storage memory section; determining, by an application program determining module, a type and version of an installed application program to reproduce the downloaded content data by referring to a starting file, the starting file being downloaded from a web server and including a content Uniform Resource Locator (URL) corresponding to the downloaded content data; verifying, by a verifying section, the determined type and version of the installed application program as allowed or disallowed based on a verification file which indicates at least one type or version of an application program disallowed from processing the content data or at least one type or version of an application program allowed for processing the content data; and reproducing, by a reproducing section, the content data with the application program, when the application program is verified as allowable, and displaying, by a display section, a message suggesting installation of another type or version of an application program, when the application program is verified as disallowed.