1. An information processing apparatus comprising a processor, wherein the processor executes a process including: while a character string candidate in a first character format is presented and when a character in a second character format is selected, presenting character string candidates in the first character format and the second character format, the second character format being different from the first character format; while character string candidates in the first character format and the second character format are presented and when a character in the second character format is selected, presenting a character string candidate in the second character format; and while a character string candidate in the second character format is presented and when a character in a character format other than the second character format is selected, presenting a character string candidate in the first character format.