To obtain an Internet terminal device, on which efficient data storage management environment wherein a limited information storage area can be used as effectively as possible, is constructed by performing a compressing processing for reducing the size of data for the acquired data and storing the compressed data in the information storage area.

A communication part 7 acquires data regarding information services through the Internet 5. A storage management part 17 performs the size compressing processing for reducing data size for the data acquired by the communication part 7 and also stores the compressed data in the information storage area owned by an acquired data storage part 15. Therefore, the Internet terminal device 1, having the efficient data storage management environment wherein the limited storage area can be used as effectively as possible is obtained, when the data acquired through the Internet 5 are stored in the information storage area owned by the acquired data storage part 15.