PURPOSE: To obtain a synthesized voice having an intonation suitable for a Japanese language by distributing a text to subjects and predicates the divide the text into clause units and determining a fundamental intonation and a word accent width in accordance with the number of clauses and positions of clauses with respect to each of subjects and predicates.

CONSTITUTION: A sentence analyzer 5b refers to a grammar dictionary 6 and a word dictionary 7 to divide a Japanese-language input text into clause units and distributes respective clauses to subjects and predicates and determines a fundamental intonation set in a table 8 in accordance with number of clauses and clause positions with respect to each of subjects and predicates and determines a word accent width set in a table 9 in accordance with the number of clauses and clause positions with respect to each of subjects and predicates. These fundamental intonations and word accents to which word accent widths are given are superposed to obtain a sentence intonation, thereby obtaining a sentence intonation in accordance with fundamental intonation patterns and accent widths given to word accent positions. Thus, metrical information suitable for the Japanese language is obtained.