Provided is a communication apparatus capable of affording an equivalent level of security for both facsimile transmission and electronic mail without the user needing to be aware of the difference between facsimile transmission and electronic mail. When document information is designated as being confidential ("YES" at S104 in FIG. 2) and transmission by E-mail is specified (S108, S109) at the time of a transmission, the document is encrypted and transmitted (S109-S111). When transmission by facsimile communication is specified (S108-S112), on the other hand, the document is transmitted utilizing a private security function (S114).