Abstract: A mobile device includes a memory for storing therein a subroutine management table to manage kinds of existing codes out of native code, first code and second code for a plurality of subroutines contained in content, a virtual machine, a precompile circuit for producing second code from first code and a subroutine management circuit for changing over processing in accordance with the kind of existing code for subroutine called up during execution of content. The subroutine management circuit judges kind of existing code with reference to the subroutine management table when the processing is changed over.

Abstract: There are provided a stream I/F section 7 adapted to exclusively input/output stream data such as video data or audio data from/to a host section, a non-stream I/F section 5 adapted to input/output non-stream data such as an address, a command, photo data, or text data from/to the host section 3, and a recording medium I/F section 11 adapted to input/output the stream data and the non-stream data to/from a recording medium section 4, and the stream I/F section 7 is provided with transfer control means for controlling the transfer rate of the stream data in accordance with a state of use (availability) of each of a receiving buffer 6 and a transmission buffer 8 provided independently.

Abstract: In a conventional method of organizing image data taken by a digital camera, only information on the date and time and position are attached to each data, without acquiring information related to the content of the data. Therefore, positional information is obtained and attached to the data of image or text, and when storing the data, information related to the position is acquired based on the positional information and stored in association with the data. Related information is also acquired when the data is viewed. The size of a data file is reduced with a decreased size of information attached to the file. Acquiring the latest information as well as previous information upon viewing the data is possible, since information related to the position of data creation is available in addition to information on the date and time and position, when storing and viewing the data. The acquired information enables detailed categorizing, searching and rendering of data.