1. A speech-synthesis device, comprising: a speech-synthesis unit configured to perform read-aloud processing; a user dictionary provided to register read-aloud information corresponding to a specific phrase for the speech-synthesis unit according to a user instruction, wherein the user dictionary is configured to be used commonly by a plurality of communication partner selection functions that can register name information corresponding to a name of a communication partner; and a determination unit configured to determine whether the user dictionary is to be used in a case where any one of a plurality of functions using the read-aloud processing by the speech-synthesis unit is selected, wherein the determination unit determines that the user dictionary is to be used in a case where a communication partner selection function is selected and determines that the user dictionary is not to be used in a case where a predetermined function other than the communication partner selection function is selected, and wherein, in a case where any one of the plurality of communication partner selection functions is executed and the read-aloud processing corresponding to the name information is performed by the speech-synthesis unit, whatever communication partner selection function is executed from among the plurality of communication partner selection functions, the speech-synthesis unit performs the read-aloud processing corresponding to the name information by using the user dictionary when the name of the communication partner is read-aloud.
1. A speech-synthesis device, comprising: a speech-synthesis unit configured to perform read-aloud processing; a user dictionary provided to register read-aloud information corresponding to a specific phrase for the speech-synthesis unit according to a user instruction, wherein the user dictionary is configured to be used commonly by a plurality of communication partner selection functions that can register name information corresponding to a name of a communication partner; and a determination unit configured to determine whether the user dictionary is to be used in a case where any one of a plurality of functions using the read-aloud processing by the speech-synthesis unit is selected, wherein the determination unit determines that the user dictionary is to be used in a case where a communication partner selection function is selected and determines that the user dictionary is not to be used in a case where a predetermined function other than the communication partner selection function is selected, and wherein, in a case where any one of the plurality of communication partner selection functions is executed and the read-aloud processing corresponding to the name information is performed by the speech-synthesis unit, whatever communication partner selection function is executed from among the plurality of communication partner selection functions, the speech-synthesis unit performs the read-aloud processing corresponding to the name information by using the user dictionary when the name of the communication partner is read-aloud. 3. The speech-synthesis device according to claim 1 , wherein the speech-synthesis unit has two modes including a mode of performing the read-aloud processing by using the user dictionary and a mode of performing the read-aloud processing without using the user dictionary, and wherein each of the two modes can be selected from the plurality of functions.