7. The speech recognition method according to claim 1 , further comprising: adding weight values given in accordance with certain determination results for the character information, wherein the determining determines whether a sum of the weight values added in the adding is greater than or equal to a certain value, and, in a case where the sum of the weight values is greater than or equal to the certain value, determines that the speech is spoken to the one or more devices.
7. The speech recognition method according to claim 1 , further comprising: adding weight values given in accordance with certain determination results for the character information, wherein the determining determines whether a sum of the weight values added in the adding is greater than or equal to a certain value, and, in a case where the sum of the weight values is greater than or equal to the certain value, determines that the speech is spoken to the one or more devices. 8. The speech recognition method according to claim 7 , wherein the adding adds a weight value given in accordance with whether a sentence pattern of the character information is interrogative or imperative, a weight value given in accordance with whether a silent time from when obtaining of the speech information is completed to when obtaining of next speech information is started is greater than or equal to a certain time, a weight value given in accordance with whether a pre-stored certain keyword regarding an operation of the one or more devices is included in the character information, a weight value given in accordance with whether a pre-stored personal name is included in the character information, a weight value given in accordance with whether a plurality of people is detected in a space where the one or more devices are located, and a weight value given in accordance with whether a conjugated form of a declinable word or phrase included in the character information is imperative.