Mobile device and content transmission method

The present invention provides a mobile device that makes it simple to perform content updates. The mobile device comprises a content storage portion for storing content, a content update portion for updating the content of the content storage portion, a user information storage portion for storing user information as saved user data, an input acceptance portion for accepting the inputted user information as input user data, and a sameness judgment portion for judging the sameness of the saved user data and the input user data. When the sameness judgment portion judges that the saved user data and the input user data are not the same, the content update portion erases the content stored in the content storage portion, requests that content corresponding with the input user data be transmitted to the mobile communication network to which the mobile device belongs and stores the transmitted content in the content storage portion.