The invention discloses an elder accompanying intelligent dialogue method and
system based on a user portrait, and relates to the technical field of intelligent interaction, and the method comprises the steps: calculating user features based on multi-
modal data, splicing the user features into a user portrait vector, generating a
frame sequence from voice, calculating an interaction
feature vector, constructing an interaction sequence, generating a prefix tree, and extracting all paths. Calculating a support degree, and generating a candidate mode set; extracting an intention
label corresponding to each mode in the candidate mode set, generating a frequent mode set, calculating similarity, generating an associated intention
label and confidence, extracting frequency features in user portrait vectors, splicing the frequency features into interest feature sub-vectors, calculating joint utility, and selecting a maximum value as an optimal intention. According to the method, through combination of the prefix tree and frequent pattern mining and interaction
sequence clustering, the capability of capturing long-term interaction behavior rules of old people is enhanced, and through combination of interest utility and matching utility, the accuracy of intention
inference is improved.