Patent ID: 7076549

Claim:
A computer executing an electronic mail (E-mail) program, comprising: a reception storing unit receiving an E-mail with an attached file from a communication network, and storing the attached file as a part of the E-mail; a power changing unit setting access power information, referred to when the attached file accesses another file, and forcibly setting a selected file access power level into the file access power information of an attached file, the file access power information having a plurality of selectable file access power levels; a comparison unit comparing the selected file access power level with a file access power level defined in the file access power information assigned to the other file, to determine whether to permit the attached file to access the other file; and an execution supervising unit supervising an access error caused by the comparison of the respective file access power information, executing a predetermined error process when the access error is detected, and informing a user of the access error.