An objective is to prevent a downloaded application from accessing data in an external memory unrelated to the application, and to achieve safer management of access to the external memory. An external memory function module 15 is a function module that controls access of an application downloaded in a cell phone 1, to an external memory 2. This external memory function module 15 has a bind ID acquirer 156 for acquiring a bind ID to specify the application downloaded, a discrimination ID acquirer 157 for acquiring a directory discrimination ID to specify an application permitted to access a directory, and an access controller 158 for checking the bind ID against the directory discrimination ID and for, when they coincide with each other, performing such control as to permit access of the application to the directory.