A participant list display method is provided in which, when referring to status and details of a participant with many utterances, it is possible to reduce effort required in page turning or scrolling operations. In step S1 a mobile telephone performs utterance processing for a participant in PTT communication, to perform PTT starting processing; in step S2, a variable is acquired in working memory for counting number of utterances for each participant; and in step S3 a state of waiting to obtain a right to speak is entered. In the mobile telephone, from the state of waiting to obtain the right to speak, when a party who wishes to speak obtains the right to speak in step S4, a count of number of utterances for the participant that is stored in the working memory is incremented in step S5. The mobile telephone refers to the number of utterances for each participant stored in the working memory, and sorts the list of participants displayed on the display unit, in order of number of utterances.